As part of the keynote panel at the 2014 CTR Symposium, Dr. Jirsa discussed 50 years of significant accomplishments at the Ferguson Structural Engineering Laboratory at the University of Texas at Austin.
The 2014 CTR Symposium featured a keynote panel of leaders in structural engineering from the Ferguson Structural Engineering Laboratory at the University of Texas at Austin. Featuring innovative work done for TxDOT through the years through CTR, Dr. John Breen discussed significant accomplishments.
This lecture discusses precast concrete construction. It differentiates between architectural and structural precast concrete. Total precast construction uses only precast concrete for all building elements, while mixed precast combines precast with other materials. Joints and connections between precast elements are crucial and include slab to slab, slab to beam, and column to column connections. The construction process for precast buildings is similar to steel construction, with elements connected by welding or bolting after being lifted into place by crane.
Literature work study of precast concrete connections in seismicIAEME Publication
1. The document summarizes several studies on precast concrete connections, focusing on beam-column connections.
2. Key findings from the literature include that ductile connections can be designed to withstand seismic forces if connecting elements are used, and that hybrid post-tensioned and Dywidag Ductile connector systems have shown promise in seismic regions.
3. Finite element modeling studies found that accounting for shear transfer through vertical joints between precast wall panels provides more accurate force estimates than models neglecting this effect.
Brief Study about Prestressed Steel Concrete Composite GirderRohit kumar Mittal
In this presentation, introduction about different types of composite girder along with it's working is given.
This presentation tells about the fabrication procedure of the Prestressed Concrete Steel Composite Bridge. It also deals with different components of system design and different stages of analysis of Prestressed Concrete Steel Composite Girder.
It is also mentioned about finite element analysis procedure with elements selected for different materials, finite element analysis results, experimental investigation and examples with importance of such types of girder over other.
Regarding basics of prestressed such as inventor, types of prestressing systems, methods of prestressing, types of grouting, types of cables used for prestressed structure and method of construction etc..
This document discusses bridge defects and maintenance. It covers topics like acoustic emission testing of concrete bridges, common bridge defects like corrosion, and methods to protect bridges. Bridge deck waterproofing is also discussed, noting the two main types of waterproofing systems used are sheet and liquid sprayed systems. The document emphasizes the importance of maintenance to enhance bridge durability and extend lifespan.
The document discusses precast concrete structures. It describes how precast construction involves manufacturing structural components in a controlled plant environment using standardized molds, then transporting them to the construction site for assembly. Precast offers advantages like higher quality control, faster construction, and less on-site labor. The document outlines the precasting process and various connection techniques. It provides examples of precast floor and roof systems.
The document discusses steel framing systems, including cold-formed structures and composite floor slabs. It provides details on the manufacturing process of cold-formed steel and installation of composite slabs. Advantages such as strength, durability and cost effectiveness are highlighted. Two case studies on buildings using these steel systems show significant savings in cost and construction time compared to other materials.
The 2014 CTR Symposium featured a keynote panel of leaders in structural engineering from the Ferguson Structural Engineering Laboratory at the University of Texas at Austin. Featuring innovative work done for TxDOT through the years through CTR, Dr. John Breen discussed significant accomplishments.
This lecture discusses precast concrete construction. It differentiates between architectural and structural precast concrete. Total precast construction uses only precast concrete for all building elements, while mixed precast combines precast with other materials. Joints and connections between precast elements are crucial and include slab to slab, slab to beam, and column to column connections. The construction process for precast buildings is similar to steel construction, with elements connected by welding or bolting after being lifted into place by crane.
Literature work study of precast concrete connections in seismicIAEME Publication
1. The document summarizes several studies on precast concrete connections, focusing on beam-column connections.
2. Key findings from the literature include that ductile connections can be designed to withstand seismic forces if connecting elements are used, and that hybrid post-tensioned and Dywidag Ductile connector systems have shown promise in seismic regions.
3. Finite element modeling studies found that accounting for shear transfer through vertical joints between precast wall panels provides more accurate force estimates than models neglecting this effect.
Brief Study about Prestressed Steel Concrete Composite GirderRohit kumar Mittal
In this presentation, introduction about different types of composite girder along with it's working is given.
This presentation tells about the fabrication procedure of the Prestressed Concrete Steel Composite Bridge. It also deals with different components of system design and different stages of analysis of Prestressed Concrete Steel Composite Girder.
It is also mentioned about finite element analysis procedure with elements selected for different materials, finite element analysis results, experimental investigation and examples with importance of such types of girder over other.
Regarding basics of prestressed such as inventor, types of prestressing systems, methods of prestressing, types of grouting, types of cables used for prestressed structure and method of construction etc..
This document discusses bridge defects and maintenance. It covers topics like acoustic emission testing of concrete bridges, common bridge defects like corrosion, and methods to protect bridges. Bridge deck waterproofing is also discussed, noting the two main types of waterproofing systems used are sheet and liquid sprayed systems. The document emphasizes the importance of maintenance to enhance bridge durability and extend lifespan.
The document discusses precast concrete structures. It describes how precast construction involves manufacturing structural components in a controlled plant environment using standardized molds, then transporting them to the construction site for assembly. Precast offers advantages like higher quality control, faster construction, and less on-site labor. The document outlines the precasting process and various connection techniques. It provides examples of precast floor and roof systems.
The document discusses steel framing systems, including cold-formed structures and composite floor slabs. It provides details on the manufacturing process of cold-formed steel and installation of composite slabs. Advantages such as strength, durability and cost effectiveness are highlighted. Two case studies on buildings using these steel systems show significant savings in cost and construction time compared to other materials.
This document outlines the advantages of using post-tensioning in building structures. Post-tensioning allows for longer spans, reduced floor thickness, increased floor area, faster construction speeds, and reduced material usage. It discusses common post-tensioning systems used in building floors and specialized structural elements. Post-tensioning provides more flexible and economical building structures compared to other methods.
One Museum Park West (Post-Tensioning case study)AMSYSCO Inc.
The One Museum Park West high-rise condominium tower in Chicago was originally designed with conventionally reinforced concrete slabs and transfer girders, but went over budget. A value engineering analysis proposed converting the structural design to unbonded post-tensioning, which would reduce costs by deleting some interior columns, transfer girders, and reducing girder depths. This option was chosen and resulted in $4 million in savings through reductions to concrete, rebar, forming costs, and other structure elements like caissons and walls. The post-tensioning supplier worked with the engineer of record to implement the new design, which increased PT usage from an initial 35,000 feet to 1.6 million feet and helped complete
Post-tensioning is a technique for reinforcing concrete structures. The prestressing steel cables inside the sleeves or plastic ducts are positioned in the forms before placing the concrete. As the concrete gains strength, the cables are stressed to design forces before the application of the service load and are anchored att the outer edge region of the concrete.
Fiberglass Rebar is an ultimate construction solution that protect concrete structures against severe environment.
For more information visit our website www.tuf-bar.com
Prestressed concrete is concrete that is placed under compression using tensioned steel strands, cables, or bars. This is done through either pre-tensioning or post-tensioning. In pre-tensioning, the steel components are tensioned before the concrete is poured, while in post-tensioning, the steel components are tensioned after the concrete has hardened. Prestressed concrete provides benefits over reinforced concrete like lower construction costs, thinner structural elements, and longer spans between supports.
How to Guarantee Design-Life of Concrete Structures-MasterBuilder-July 2016Dr.Subramanian Narayanan
1) Concrete structures designed for 50-60 years of service life often deteriorate more quickly, with maintenance costs comprising 40-50% of construction spending in some places.
2) Roman structures like the Pantheon, built over 2000 years ago using slow-hardening lime cements, remain in excellent condition, while 20th century structures using Portland cement often deteriorate within 10-20 years.
3) To reliably achieve 100+ year design lives, concrete must be properly specified, mixed, placed, compacted and cured, rather than just focusing on short-term strength as was common practice.
Construction of prestressed concrete structuressanmilan
This document discusses different construction methods for prestressed concrete bridges. It describes the cantilever construction method, segmental construction method using precast segments, and incremental launching method. For the cantilever method, segments are cast in place cantilevering from each side of the pier. For segmental construction, precast segments are cast off-site and erected using launchers or cranes. The incremental launching method involves casting segments behind the abutment and pushing them forward as subsequent segments are added.
This document provides an overview of the construction process for post-tension slabs. It begins with a brief history of post-tensioned concrete before defining post-tension slabs as reinforced concrete slabs supported directly by columns without beams. The construction process involves installing strands or tendons in ducts before pouring concrete, stressing the strands after the concrete reaches strength, and then grouting the ducts. Key advantages of post-tension slabs are that they are lighter, allow for greater flexibility in design, and have reduced costs compared to conventional slabs.
Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Post-tensioning applications include office and apartment buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, and water-tanks.
>>>Published by Post-Tensioning Institute
Prestressed concrete bridges have many advantages over other bridge types. They have lower initial costs and require little maintenance, resulting in lower life-cycle costs. Precast prestressed concrete bridges can also be constructed very quickly, sometimes in just a few weeks, minimizing traffic disruptions. The use of precast components allows bridges to be built year-round and opened to traffic more rapidly than other bridge types.
This document provides an overview of precast concrete, including:
- A brief history of precast concrete usage from ancient Romans to modern applications
- The advantages of precast concrete such as quality control and weather independence
- Comparisons of precast vs cast-in-place and precast vs prestressed concrete
- Explanations of wet cast vs dry cast production methods
- Examples of common precast concrete products for utilities, transportation, and structures
- The typical design, manufacturing, handling, and installation processes
- A case study of a precast concrete bridge replacement project
Multi storey structural steel structuresThomas Britto
Steel has been used in construction for over 150 years. Its use in Hong Kong started in the 1970s with projects like the Park Lane Hotel. Steel has properties that make it suitable for high-rise buildings like strength and versatility, though it can be heavy, lose strength in heat, and rust. Standard steel sections provide design flexibility. Connections are made through joints like splices and welds. Common frame types include simple cage frames, cantilevers, wind-braced, and core structures. Steel construction has advantages like lighter weight and flexibility for changes, but has challenges like fire resistance, movement, and corrosion protection.
This presentation discusses the evolution and benefits of expressed and exposed bracing systems in architecture. It traces the development of bracing from early examples in high-tech architecture to more modern applications as architecturally exposed structural steel (AESS) and diagrid structures. Exposed bracing provides seismic benefits as it allows for easier inspection and repair. Diagrid designs integrate bracing and structure for efficiency. However, further research is needed to expand the use of exposed bracing systems through code changes, new connection details, and addressing issues like thermal bridging.
This document provides a brief history of prestressed concrete, beginning in 1824 with the development of Portland cement. It then outlines several important developments in prestressed concrete technology from the late 19th century through the mid-20th century by innovators from various countries. These include early uses of steel in concrete, prestressing methods like pre-tensioning and post-tensioning, and development of high-strength steel and anchoring systems. It also mentions increased use of prestressed concrete during World War 2 and establishment of professional organizations to support the field.
Pre-stressed concrete was a major innovation that replaced conventional reinforced concrete, allowing for longer spans, higher impact resistance, and greater load capacity without tensile stresses. It involves casting concrete around high-strength steel that is placed under compression before use to counteract tensile stresses when in service. There are two main types: pre-tensioning applies tension before casting, while post-tensioning does so after casting, using ducts to hold the steel. Pre-stressed concrete enables more efficient structures through factory casting and reduced material needs.
1) Precast concrete construction involves producing standardized structural components in a plant away from the construction site and transporting them for assembly. This allows for mass production and faster, cheaper construction of buildings.
2) Precast systems are categorized based on their load-bearing structure, including large-panel, frame, slab-column, and mixed systems. Large-panel systems use interlocking concrete wall and floor panels that form a rigid box structure. Frame systems use linear or modular beam and column elements. Slab-column systems rely on shear walls for lateral loads and slabs/columns for gravity loads.
3) Past earthquakes showed that precast structures can perform well structurally when properly designed and constructed, such
GFRP fiberglass rebar has several key benefits over traditional steel rebar including being lighter weight, not susceptible to corrosion, having higher tensile strength, and providing excellent bond strength. It can help resolve structural deterioration issues and offers aesthetic possibilities, dimensional stability, ease of installation, and flexible design. The document also provides information on fiberglass rock bolts, form ties, and lifting anchors that the company produces utilizing their strongest fiberglass rebar, which has benefits like corrosion resistance, high strength, and lighter weight compared to steel.
Pre stressed concrete- modular construction technologyAnjith Augustine
This document provides an overview of pre-stressed concrete, including its history, types (pre-tensioning and post-tensioning), materials, applications, advantages, and tensioning devices. Some key points include: pre-stressed concrete was developed in the 1930s-1940s and the first pre-stressed concrete bridge was built in India in 1948; it uses high-strength steel tendons to put concrete under compression and improve its tensile strength; common applications include bridges, buildings, and other structures; and advantages are increased strength, reduced cracking, and lighter/thinner designs.
Todd Humphreys recently presented at the CTR Symposium on the vulnerabilities of wireless communications, and the future of how it applies to autonomous vehicles.
This document describes the energy transfers that occur in a mouse trap car. When the mouse trap is loaded, it stores potential energy. When triggered, the potential energy is converted to kinetic energy which powers the wheels. As the wheels spin, their kinetic energy is transformed into thermal energy through friction, causing them to slow down until all the energy is dissipated and the car stops.
This document outlines the advantages of using post-tensioning in building structures. Post-tensioning allows for longer spans, reduced floor thickness, increased floor area, faster construction speeds, and reduced material usage. It discusses common post-tensioning systems used in building floors and specialized structural elements. Post-tensioning provides more flexible and economical building structures compared to other methods.
One Museum Park West (Post-Tensioning case study)AMSYSCO Inc.
The One Museum Park West high-rise condominium tower in Chicago was originally designed with conventionally reinforced concrete slabs and transfer girders, but went over budget. A value engineering analysis proposed converting the structural design to unbonded post-tensioning, which would reduce costs by deleting some interior columns, transfer girders, and reducing girder depths. This option was chosen and resulted in $4 million in savings through reductions to concrete, rebar, forming costs, and other structure elements like caissons and walls. The post-tensioning supplier worked with the engineer of record to implement the new design, which increased PT usage from an initial 35,000 feet to 1.6 million feet and helped complete
Post-tensioning is a technique for reinforcing concrete structures. The prestressing steel cables inside the sleeves or plastic ducts are positioned in the forms before placing the concrete. As the concrete gains strength, the cables are stressed to design forces before the application of the service load and are anchored att the outer edge region of the concrete.
Fiberglass Rebar is an ultimate construction solution that protect concrete structures against severe environment.
For more information visit our website www.tuf-bar.com
Prestressed concrete is concrete that is placed under compression using tensioned steel strands, cables, or bars. This is done through either pre-tensioning or post-tensioning. In pre-tensioning, the steel components are tensioned before the concrete is poured, while in post-tensioning, the steel components are tensioned after the concrete has hardened. Prestressed concrete provides benefits over reinforced concrete like lower construction costs, thinner structural elements, and longer spans between supports.
How to Guarantee Design-Life of Concrete Structures-MasterBuilder-July 2016Dr.Subramanian Narayanan
1) Concrete structures designed for 50-60 years of service life often deteriorate more quickly, with maintenance costs comprising 40-50% of construction spending in some places.
2) Roman structures like the Pantheon, built over 2000 years ago using slow-hardening lime cements, remain in excellent condition, while 20th century structures using Portland cement often deteriorate within 10-20 years.
3) To reliably achieve 100+ year design lives, concrete must be properly specified, mixed, placed, compacted and cured, rather than just focusing on short-term strength as was common practice.
Construction of prestressed concrete structuressanmilan
This document discusses different construction methods for prestressed concrete bridges. It describes the cantilever construction method, segmental construction method using precast segments, and incremental launching method. For the cantilever method, segments are cast in place cantilevering from each side of the pier. For segmental construction, precast segments are cast off-site and erected using launchers or cranes. The incremental launching method involves casting segments behind the abutment and pushing them forward as subsequent segments are added.
This document provides an overview of the construction process for post-tension slabs. It begins with a brief history of post-tensioned concrete before defining post-tension slabs as reinforced concrete slabs supported directly by columns without beams. The construction process involves installing strands or tendons in ducts before pouring concrete, stressing the strands after the concrete reaches strength, and then grouting the ducts. Key advantages of post-tension slabs are that they are lighter, allow for greater flexibility in design, and have reduced costs compared to conventional slabs.
Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Post-tensioning applications include office and apartment buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, and water-tanks.
>>>Published by Post-Tensioning Institute
Prestressed concrete bridges have many advantages over other bridge types. They have lower initial costs and require little maintenance, resulting in lower life-cycle costs. Precast prestressed concrete bridges can also be constructed very quickly, sometimes in just a few weeks, minimizing traffic disruptions. The use of precast components allows bridges to be built year-round and opened to traffic more rapidly than other bridge types.
This document provides an overview of precast concrete, including:
- A brief history of precast concrete usage from ancient Romans to modern applications
- The advantages of precast concrete such as quality control and weather independence
- Comparisons of precast vs cast-in-place and precast vs prestressed concrete
- Explanations of wet cast vs dry cast production methods
- Examples of common precast concrete products for utilities, transportation, and structures
- The typical design, manufacturing, handling, and installation processes
- A case study of a precast concrete bridge replacement project
Multi storey structural steel structuresThomas Britto
Steel has been used in construction for over 150 years. Its use in Hong Kong started in the 1970s with projects like the Park Lane Hotel. Steel has properties that make it suitable for high-rise buildings like strength and versatility, though it can be heavy, lose strength in heat, and rust. Standard steel sections provide design flexibility. Connections are made through joints like splices and welds. Common frame types include simple cage frames, cantilevers, wind-braced, and core structures. Steel construction has advantages like lighter weight and flexibility for changes, but has challenges like fire resistance, movement, and corrosion protection.
This presentation discusses the evolution and benefits of expressed and exposed bracing systems in architecture. It traces the development of bracing from early examples in high-tech architecture to more modern applications as architecturally exposed structural steel (AESS) and diagrid structures. Exposed bracing provides seismic benefits as it allows for easier inspection and repair. Diagrid designs integrate bracing and structure for efficiency. However, further research is needed to expand the use of exposed bracing systems through code changes, new connection details, and addressing issues like thermal bridging.
This document provides a brief history of prestressed concrete, beginning in 1824 with the development of Portland cement. It then outlines several important developments in prestressed concrete technology from the late 19th century through the mid-20th century by innovators from various countries. These include early uses of steel in concrete, prestressing methods like pre-tensioning and post-tensioning, and development of high-strength steel and anchoring systems. It also mentions increased use of prestressed concrete during World War 2 and establishment of professional organizations to support the field.
Pre-stressed concrete was a major innovation that replaced conventional reinforced concrete, allowing for longer spans, higher impact resistance, and greater load capacity without tensile stresses. It involves casting concrete around high-strength steel that is placed under compression before use to counteract tensile stresses when in service. There are two main types: pre-tensioning applies tension before casting, while post-tensioning does so after casting, using ducts to hold the steel. Pre-stressed concrete enables more efficient structures through factory casting and reduced material needs.
1) Precast concrete construction involves producing standardized structural components in a plant away from the construction site and transporting them for assembly. This allows for mass production and faster, cheaper construction of buildings.
2) Precast systems are categorized based on their load-bearing structure, including large-panel, frame, slab-column, and mixed systems. Large-panel systems use interlocking concrete wall and floor panels that form a rigid box structure. Frame systems use linear or modular beam and column elements. Slab-column systems rely on shear walls for lateral loads and slabs/columns for gravity loads.
3) Past earthquakes showed that precast structures can perform well structurally when properly designed and constructed, such
GFRP fiberglass rebar has several key benefits over traditional steel rebar including being lighter weight, not susceptible to corrosion, having higher tensile strength, and providing excellent bond strength. It can help resolve structural deterioration issues and offers aesthetic possibilities, dimensional stability, ease of installation, and flexible design. The document also provides information on fiberglass rock bolts, form ties, and lifting anchors that the company produces utilizing their strongest fiberglass rebar, which has benefits like corrosion resistance, high strength, and lighter weight compared to steel.
Pre stressed concrete- modular construction technologyAnjith Augustine
This document provides an overview of pre-stressed concrete, including its history, types (pre-tensioning and post-tensioning), materials, applications, advantages, and tensioning devices. Some key points include: pre-stressed concrete was developed in the 1930s-1940s and the first pre-stressed concrete bridge was built in India in 1948; it uses high-strength steel tendons to put concrete under compression and improve its tensile strength; common applications include bridges, buildings, and other structures; and advantages are increased strength, reduced cracking, and lighter/thinner designs.
Todd Humphreys recently presented at the CTR Symposium on the vulnerabilities of wireless communications, and the future of how it applies to autonomous vehicles.
This document describes the energy transfers that occur in a mouse trap car. When the mouse trap is loaded, it stores potential energy. When triggered, the potential energy is converted to kinetic energy which powers the wheels. As the wheels spin, their kinetic energy is transformed into thermal energy through friction, causing them to slow down until all the energy is dissipated and the car stops.
This document summarizes a presentation on dynamic traffic modeling applications and research frontiers. It discusses how dynamic traffic assignment models integrate supply-side factors like road closures and demand-side factors like driver route choices to find traffic flow equilibriums. The document outlines applications of dynamic modeling to work zone impact analysis and emissions modeling. It also explores research frontiers involving easier model calibration, integration with activity-based models, and modeling impacts of autonomous vehicles.
The document discusses water supply planning for the City Council. It summarizes that the city's permitted water supply from wells in the Simsboro aquifer is currently adequate but development, legislation, and groundwater regulations must be monitored. It outlines the water master plan process including upcoming updates, involvement in regional water planning which will prioritize projects for state funding, and potential pursuit of low-interest loans from the new State Water Implementation Fund for Texas (SWIFT).
Railway Track Construction Monitoring On Daily Basis Via Google Earth In 3D- ...Vaseem Farooqui
The document discusses 3D modeling of railway tracks at steel and cement plants. It contains 3D renderings showing:
1. Railway layouts inside and just outside a steel plant, including the main line connectivity, in-plant track layout, and merry-go-round track layout at the buffer end.
2. Different views of the track layout at a cement plant, including the main line, ground level, and formation level in 3D, as well as work needing to be done like filling or cutting of the ground.
3. An aerial view of the full track layout from the mainline to the buffer end inside a steel plant, and a bird's eye view of the overall track layout
The document outlines the five stages of manufacturing Portland cement: (1) calcareous and argillaceous materials are crushed and ground; (2) the materials are elevated and stored to regulate ratios; (3) the materials are fired in a rotary kiln to produce clinker; (4) gypsum is added to the clinker, which is then ground into powder; (5) the cement is stored in silos, weighed, packed, and supplied. The manufacturing process binds the materials through heating and cooling to produce the final product.
This document discusses different types of retaining walls used in civil engineering structures. It outlines four main types: gravity walls which rely on mass to resist pressure; cantilever retaining walls made of reinforced concrete or masonry in an inverted T-shape; counterfort retaining walls which have vertical stems and heel slabs strengthened by counterforts at intervals; and buttressed walls which are a modification using buttresses on the backfill side.
Treatment plant capacity – 180,000 m3/day; Construction of Raw Water Intake pumping station (4 pumps with each pump capacity 737 l/s), Flocculation and Clarification Units (total V=12500m3), Gravity Filters (total V=7000m3), Contact/Clear Water Tanks (totalV=10000m3), Treated Water PS, Sludge treatment Units, Chemical, Chlorine and Administrative buildings. Total in-situ reinforced concrete quantity – 21000m3;
This document provides an overview of the chapters in a book on steel-concrete composite bridges. The book reviews different forms of composite construction and then examines common composite bridge types in more detail. It covers topics such as simple beam bridges, integral bridges, continuous bridges, viaducts, box girders, trusses, arches, cable stay bridges, and prestressed composites. The document lists the chapters and includes brief descriptions of some of the structural concepts discussed in the book. It also outlines several appendices that provide calculations for section properties and structural behavior.
The document lists the product range of N.M. Enterprises including reverse osmosis plants, demineralized plants, water softening plants, ultra filtration systems, effluent treatment plants, swimming pool filteration, water treatment components, chemicals, and after sales service. It provides contact information for N.M. Enterprises in Ahmedabad, Gujarat, India for any further information.
IMPACT OF MARBLE DUST ON CEMENT CONCRETE PROPERTIES SCPurohit
it is Innovative project persentation on MPACT OF MARBLE DUST ON CEMENT CONCRETE PROPERTIES (Civil Engineering) because cement which is important materail for concrete without cement concrete is useless but marble reduse the cost of cement and make it economic and reduse the cost of the project.
thank you
SCP
Replacement of cement by glass powder and sand quarry dustRakshith Suvarna
This document summarizes 10 research papers on the use of glass powder and quarry dust as partial replacements for cement and sand in concrete. Several key findings across the papers include: Glass powder can be used to replace up to 20-30% of cement, improving the compressive strength and durability of concrete. Finer glass powder (<90 microns) provides better strength results than coarser powder. Quarry dust can partially replace sand, but workability may decrease requiring additives. Combining quarry dust and glass powder as replacements produces concrete with strength comparable to normal concrete.
The City of Amsterdam water treatment plant has a highly experienced staff with over 200 years of combined experience. The plant draws water from the 5,000 acre Glen Wild watershed in the Adirondacks, which has supplied the city's water since 1890. The plant underwent a $10.5 million upgrade in 2009-2011 to improve water treatment capabilities and remain in compliance with regulations. Operators are licensed and trained to ensure the continued delivery of safe, clean drinking water to city residents.
Discription on Ready Mix Concrete, Vacuum Concrete,Shortcrete,Ferrocement,Light Weight Concrete,Air Entrained Concrete, Fiber Reinforced Concrete,Polymer Concrete.
Unit 5, according to Rajiv Gandhi Technological University syllabus.
Railway tracks require stable earthworks to support the ballast, sleepers, and rails. There are several components involved in railway track formation including the subgrade, ballast, and drainage systems. Formations can be constructed as embankments raised above the existing ground level or cuttings made by excavating below ground level. The minimum recommended widths for formations depend on the track gauge and number of lines. Proper slopes and drainage are also important to maintain stability. Various methods like using layers of moorum or rubble, cement grouting, sand piles, or chemical treatments can help stabilize formations built on poor soils.
Earthquakes occur along plate boundaries due to the buildup and sudden release of energy from shifting tectonic plates. When plates lock, potential energy builds until released as seismic waves that propagate outward from the earthquake focus. Most earthquakes occur along oceanic and continental plate edges or along faults like normal, reverse, and transform boundaries. P and S waves are the primary seismic waves, with P waves traveling faster and S waves causing the shaking felt during quakes. Earthquake magnitude measures the energy released using the Richter scale, while intensity qualitatively describes the shaking effects on a place using the Mercalli scale.
Nano technology involves manipulating materials at the nanometer scale to develop new large scale materials with improved properties. In civil engineering, nano technology is being applied to concrete, glass, steel, and coatings to enhance strength, durability, and other qualities. Some applications include using nano silica to strengthen concrete, titanium dioxide to provide self-cleaning and anti-microbial properties to surfaces, and carbon nanotubes to reinforce cement and increase its mechanical properties. Nano technology shows promise for significantly advancing materials used in civil engineering construction and infrastructure.
Earthquakes are caused by the movement of tectonic plates underneath the earth's surface. When the plates shift and release stress, seismic waves propagate outward from the epicenter. Scientists measure the intensity of earthquakes using the Richter scale. During an earthquake, it is important to drop, cover, and hold on underneath sturdy furniture to protect oneself from falling debris.
The document introduces a tubular rivet foundation as an alternative to traditional gravity foundations for wind turbines. Key points:
- Tubular rivet foundations consist of an inner and outer tube connected by structural members like arm beams and a circular grade beam, anchored deep into the ground like a fastener.
- They are constructed by excavating a hollow tube using long-reach equipment. Reinforced concrete is then cast to form a rigid connection between members.
- Analysis shows they can reduce engineering quantities of concrete and steel by 20-45% compared to gravity foundations, with savings increasing in difficult soil conditions. Construction is also faster with less environmental impact.
- The foundation acts as both an anchor and
FRP bridges are made of fibre reinforced polymers and offer advantages over traditional materials like concrete and steel. They are lightweight, durable, require little maintenance, and can be installed quickly with minimal disruption. The first FRP bridge was built in the early 1970s, but they are still considered innovative in the construction industry. Jacobs has been involved in FRP bridge research, design, and industry guidance development since the 1990s. FRP bridges are well suited for applications where weight, maintenance, site access, or environmental factors are important considerations.
This document discusses best practices for flexible pavement widening projects. Widening projects are undertaken to improve safety by reducing edge failures, provide greater traffic separation, and enhance pavement performance by addressing issues like rutting and drainage problems at the edges. Construction challenges include narrow work areas, variable subgrade support, drainage issues, and limitations on equipment. Failures can occur due to differences in the old and new pavement structures, improper joint construction, insufficient compaction and settlement, moisture penetration issues, and drainage or slope stability problems. The document proposes a webinar to gather input from transportation agencies, contractors, and equipment manufacturers on successful and unsuccessful pavement widening projects to identify good practices and standards.
MODERN CONSTRUCTION TECHNOLOGIES IN ENGINEERING PERSPECTIVEDr K M SONI
Modern construction technologies provide advantages like faster construction, higher quality, environmental benefits, and ability to overcome lack of skilled workers. Technologies discussed include prefabricated buildings, tunnel formwork, jump formwork, reinforced soil, trenchless techniques, 3D printing, robotics, and more. While technologies increase speed and quality, some have limitations like limited architectural features, difficulty modifying structures, and higher initial costs. Overall, modern techniques can help qualify projects for sustainability and efficiency if the appropriate technology is selected for each project's unique requirements.
This document summarizes a presentation on parking structure maintenance. It discusses types of parking facilities including on-street, surface lots, and structures. Common structure materials like cast-in-place concrete, precast concrete, and structural steel are compared. Lifecycle costs are presented showing cast-in-place concrete has the lowest annual costs but highest initial investment. Common deficiencies in parking structures like water intrusion, cracking, corrosion, and failed joints are illustrated. The importance of routine maintenance and timely restoration is emphasized to manage costs over the structure lifespan.
This document discusses the process of selecting bridge types and provides an overview of common bridge types. It describes evaluating potential bridge types based on engineering constraints, costs, environmental and stakeholder impacts. Key bridge types are then summarized, including girder, segmental concrete, truss, arch, cable-stayed, suspension and movable bridges. Their structural properties, construction methods, advantages and challenges are outlined.
The document discusses the use of fiber reinforced concrete (FRC) for infrastructure applications such as canal lining and tunnel construction. It outlines several benefits of using FRC, including improved ductility, crack control, reduced permeability, and potential cost savings from faster construction. The author proposes developing standardized test methods, mixture designs, and design guidelines for using FRC in applications like precast concrete, shotcrete, and canal lining to optimize structural performance and durability. Guidelines from committees like ACI 544 are also discussed.
Airport Boulevard Railroad Grade Separation Project presented August 20, 2015, at the ASCE OC Branch Meeting, by John Ashlock, PE from County of Riverside Transportation.
A waffle slab is a reinforced concrete slab with a grid pattern on the underside created by concrete ribs running in two perpendicular directions. This provides extra stability and strength, allowing for larger spans than other slab types. Waffle slabs are used in industrial, commercial, and large buildings where large open floor plans are needed. They are constructed either by pouring concrete into molds on-site or using precast sections. The grid pattern also provides space for mechanical systems like HVAC to be placed within the slab thickness.
This document summarizes a seminar presentation on stress ribbon bridges. It defines a stress ribbon bridge as a tension structure similar to a simple suspension bridge, where the suspension cables are embedded in the deck which follows a catenary arc between supports. This provides stiffness to prevent excessive swaying. Such bridges use pre-tensioned concrete reinforced by steel cables. The document outlines the history and theory behind stress ribbon bridges, describes their construction process, and provides examples of existing stress ribbon bridges along with their advantages and disadvantages.
This document discusses developing fiber reinforced concrete specifications for structural and precast concrete applications. It outlines the project objectives to review existing FRC mixture proportioning procedures, develop typical mixes using local materials, recommend test and specification methods, and provide specifications for mechanical and durability properties. The tasks involve criteria for fibers in structural, repair, and shotcrete applications, and incorporating fibers in performance-based specifications. Applications discussed include seismic design, canal linings, precast panels, and tunnel linings.
SynTerra / US Bridge Presentation (10 24 11)dgonano
The document discusses the advantages of using pre-fabricated truss bridges for two bridge replacement projects in South Carolina. It notes that pre-fabricated truss bridges have a shallower structure depth, require less construction activity within railroad rights-of-way, and provide significant cost savings compared to traditional bridge options. The document provides details on the design, fabrication, and construction process for the pre-fabricated truss bridges.
Pt slab design philosophy with slides and pictures showing benefitPerwez Ahmad
This document summarizes the history and development of post-tensioned flat slab construction. It began with early research and development of prestressing in Europe in the 1920s-1930s to allow for longer bridge spans. Prestressing was later applied to other structures like aircraft hangars and then to flat slab construction in the 1950s. Post-tensioned flat slabs provide benefits over reinforced concrete flat slabs like reduced cracking, thinner slabs, and increased spans. The document discusses materials, design codes, comparisons to reinforced concrete, and examples of ongoing post-tensioned flat slab projects in Oman.
Ferrocement is a thin-walled construction material made of cement mortar reinforced with wire mesh. The document reports on an experimental investigation that tested various steel wire mesh configurations for constructing ferrocement water tanks. Specimens were cast and tested to determine material properties and panel strength. Compression testing of cement cubes showed increasing strength from 19 MPa at 3 days to 32 MPa at 28 days. Flexural testing found that a sandwich panel with double wire mesh layers had the highest cracking and ultimate loads, demonstrating ferrocement's potential for durable, low-cost water tanks.
Assessing and constructing a cost effective bridge replacement christopher si...mecocca5
Precast components are fabricated in a controlled plant environment allowing for increased quality control. Other benefits include expedited installation minimizing field construction time and associated costs as well as minimal environmental impacts from construction activities.
This document discusses accelerating bridge construction through modular and self-propelled modular transporter (SPMT) methods. It provides examples of contractor-driven and owner-driven accelerated bridge construction projects. Contractor-driven projects tend to be completed on time and under budget. Owner-driven projects aim to advance technologies and are often the first to use new methods, resulting in higher costs. The document outlines the benefits of accelerated bridge construction including reduced construction time, improved safety, and lower traffic impacts.
This document summarizes a presentation on parking structure maintenance. It discusses types of parking facilities including on-street, surface lots, and structures. It then covers typical structure materials like cast-in-place concrete, precast concrete, and structural steel. Common deficiencies in parking structures are also outlined such as ponding, failed joints, corrosion, cracks and more. The presentation emphasizes the importance of routine maintenance and timely restoration to reduce lifecycle costs and prevent reactive maintenance needs.
Lecture 3-Composites construction (1).pptxanik7nziza
This document discusses composite construction techniques, specifically composite metal decking with concrete and concrete-cambering composites. It describes how composite metal decking works with concrete fill to create a stiff, lightweight floor system. Methods for installing metal decking, shear connectors, and concrete are outlined. Cambering steel beams is discussed as a method to compensate for beam deflection under wet concrete loads. Quality control procedures for shear connector installation and verifying proper camber are also summarized.
IRJET- Experimental and Analytical Investigation of Fiber Reinforced Polymer ...IRJET Journal
This document provides a general review of fiber reinforced polymer (FRP) bridge deck structures. It discusses that FRP bridge decks perform better than conventional structures as they are lightweight, durable, strong, stiff, and resistant to corrosion. The document reviews the use of FRP in bridge construction in India and China. It examines the materials, design considerations, and applications of FRP bridge decks. Several studies on the behavior and performance of FRP bridge decks under different loads and conditions are also summarized. The document concludes that FRP materials show promising potential for use in bridge construction due to their technical advantages over conventional materials.
Retrofitting is the seismic strengthening of existing damaged or undamaged structures.
Retrofitting a building involves changing its systems or structure after its initial construction and occupation. This work can improve amenities for the building's occupants and improve the performance of the building
Similar to 50 years of Innovation in Bridge Design & Construction (20)
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
This document discusses ongoing research projects related to collaborative sensing and heterogeneous networking leveraging vehicular fleets. Specifically, it discusses:
1) How increased cluster density of vehicles improves overall data rates and reduces variability in individual user rates.
2) Modeling what collaborative sensing systems can "see" or be aware of in obstructed environments and how coverage benefits scale with increased penetration of collaborative vehicles.
3) Developing optimal information sharing policies to maximize situational awareness for autonomous nodes in resource-constrained network environments.
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Updates provided to the D-STOP Business Advisory Council at the 2017 Symposium and Board Meeting: https://ctr.utexas.edu/2018/04/12/d-stop-2017-symposium-archive/
Online platforms are emerging as a powerful mechanism for matching resources to requests. In the setting of freight, the requests arrive from shippers, who have a diverse collection of goods. The resources are supplied by shippers (trucks), and have various physical constraints (driver’s route preferences, carrying capacity, geographic preferences, etc.). Online platforms are emerging that (a) learn the characteristics of shippers and carriers, and (b) efficiently match goods to trucks based on such learning.
Our project will develop algorithms for such online resource allocation. This is a challenging problem, due to the complexity of the learning tasks. Such algorithms can have considerable impact on efficiently using trucking resources.
Through this project, the research team will leverage the computing resources and expertise at UT to develop a “data discovery environment” for transportation data to aid decision-making. Many efforts focus on leveraging transportation data to help travelers make decisions, but less thought has gone into a framework for using big data to help transportation agency staff and decision makers. The team will start by building the DDE for the Central Texas region, in collaboration with the local MPO, the City of Austin, and the local transit agency. Initially, the project will focus on creating more meaning from existing data sources, and as the project progresses, it will grow to include more novel data sources and methods. The data platform will be web-based and part of the research includes not only building the tool but developing appropriate protocols for access and governance.
This document discusses modeling strategies for autonomous and connected vehicles. It proposes modifying traditional four-step transportation models to account for autonomous vehicle adoption rates and different trip types. Autonomous vehicle passenger car equivalents and flow ratios are modeled based on vehicle speed, market penetration, and other factors. The document also describes plans for a 4G deployment test bed to demonstrate connected vehicle technologies on managed lanes in Dallas-Fort Worth and Virginia.
Advanced driver assistance systems (ADAS) are a key technology for improving road safety. But both current and proposed ADAS are limited in important ways. Vision- and lidar-based ADAS performs poorly in heavy rain, snow, or fog. Lack of vehicle situational awareness due to these sensing limitations will unfortunately be the cause of many accidents, including fatalities, for connected and automated vehicles in the years to come. The goal of this research is to develop and test a sensing strategy with robust perception: No blind spots, applicable to all driveable environments, and available in all weather conditions. We believe there are three key requirements for collaborative all-weather sensing:
– Precise vehicle positioning within a common reference frame
– Decimeter-accurate vision and radar mapping
– A means of quantifying the benefits of collaborative sensing
Vehicular radar and communication are the two primary means of using radio frequency (RF) signals in transportation systems. Automotive radars provide high-resolution sensing using proprietary waveforms in millimeter wave (mmWave) bands and vehicular communications allow vehicles to exchange safety messages or raw sensor data. Both the techniques can be used for applications such as forward collision warning, cooperative adaptive cruise control, and pre-crash applications.
Many areas of machine learning and data mining focus on point estimates of key parameters. In transportation, however, the inherent variance, and, critically, the need to understand the limits of that variance and the impact it may have, have long been understood to be important. Indeed, variance and other risk measures that capture the cost of the spread around the mean, are critical factors in understanding how people act. Thus they are critical for prediction, as well as for purposes of long term planning, where controlling risk may be equally important to controlling the mean (the point estimate).
There has been tremendous progress on large scale optimization techniques to enable the solution of large scale machine learning and data analytics problems. Stochastic Gradient Descent and its variants is probably the most-used large-scale optimization technique for learning. This has not yet seen an impact on the problem of statistical inference — namely, obtaining distributional information that might allow us to control the variance and hence the risk of certain solutions.
Investigation and findings on reservation-based intersections and managed lanes
Real-Time Signal Control and Traffic Stability
Congestion on urban arterials is largely centered around intersection control. Traditional traffic signal schemes are limited in their ability to adapt in real time to traffic conditions or by their ability to coordinate with each other to ensure adequate performance. Specifically, there is a tension between adaptivity (as with actuated signals) and coordination through pre-timed signals (signal progression). We propose to investigate whether routing protocols in telecommunications networks can be applied to resolve these problems. Specifically, the backpressure algorithm of Tassiulas & Emphremides (1992) can ensure system stability through decentralized control under relatively weak regularity conditions. It is as yet unknown whether this algorithm can be adapted to traffic signal systems, and if so, what modifications are needed. Traffic systems differ in several significant ways from telecommunication networks: each intersection approach has relatively few queues (lanes) that must be shared among traffic to various definitions. First-in, first-out constraints lead to head-of-line blocking effects, traffic waves move at a much slower speed than data packets, and traffic queues are tightly limited by physical space (finite buffers). Determining whether (and how) the backpressure concept can be adapted to traffic networks requires significant research, and has the potential to dramatically improve signal performance.
Improved Models for Managed Lane Operations
Managed lanes (ML) are increasingly being considered as a tool to mitigate congestion on highways with limited areas for capacity expansion. Managed lanes are dynamically priced based on the congestion level, and can be set either with the objective of maximum utilization (e.g., a public operator) or profit maximization (e.g., a private operator). Optimization models for determining these pricing policies make restrictive assumptions about the layout of these corridors (often a single entrance and exit) or knowledge of traveler characteristics on behalf of the modeler (e.g., distribution of willingness to pay). Developing new models to address these issues would allow for better utilization of these facilities.
Professor Robert W. Heath Jr. is the director of UT SAVES (Situation-Aware Vehicular Engineering Systems), which combines expertise in wireless communications, signal processing, and transportation research. UT SAVES collaborates with automotive companies like Honda R&D Americas on projects involving sensing, communication, and analytics for applications such as automated driving. Membership provides access to UT SAVES research and facilities, including graduate research assistants and experimental capabilities in areas like millimeter wave communication and sensor fusion. Current research projects focus on cooperative sensing, vehicle-to-everything communication, and applying 5G cellular networks to driving assistance technologies.
The Business Advisory Council meeting covered the following topics in 3 sentences or less:
The meeting covered updates on education and workforce development programs at the Engineering Education and Research Center including summer internships and distinguished lectures. Research updates were provided on 30 completed projects and 18 ongoing projects covering topics like connected corridors and autonomous vehicles. New proposed research was presented on topics such as video data analytics, traffic signal optimization, and modeling willingness to share trips in autonomous vehicles.
The document discusses managing mobility during the design-build reconstruction of the Dallas Horseshoe highway interchange project. It describes the project's high traffic volumes and constraints. It highlights the contractor's successes in maintaining access and maximizing work during limited closures. It stresses the importance of collaboration between the agency and contractor in developing traffic control plans and finding solutions to difficult situations.
More from Center for Transportation Research - UT Austin (20)
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
UNLOCKING HEALTHCARE 4.0: NAVIGATING CRITICAL SUCCESS FACTORS FOR EFFECTIVE I...amsjournal
The Fourth Industrial Revolution is transforming industries, including healthcare, by integrating digital,
physical, and biological technologies. This study examines the integration of 4.0 technologies into
healthcare, identifying success factors and challenges through interviews with 70 stakeholders from 33
countries. Healthcare is evolving significantly, with varied objectives across nations aiming to improve
population health. The study explores stakeholders' perceptions on critical success factors, identifying
challenges such as insufficiently trained personnel, organizational silos, and structural barriers to data
exchange. Facilitators for integration include cost reduction initiatives and interoperability policies.
Technologies like IoT, Big Data, AI, Machine Learning, and robotics enhance diagnostics, treatment
precision, and real-time monitoring, reducing errors and optimizing resource utilization. Automation
improves employee satisfaction and patient care, while Blockchain and telemedicine drive cost reductions.
Successful integration requires skilled professionals and supportive policies, promising efficient resource
use, lower error rates, and accelerated processes, leading to optimized global healthcare outcomes.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
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Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
3. • A large part of the TxDOT Research Program has
been improvement in the detailing of
transportation structures to guide design and
construction
• Hallmarks of the program
–Identification of problem areas from
designers, contractors, or maintenance
personnel
–Large-scale tests
–Implementation of research findings
4. Examples—Concrete Structures
• Development and splices of reinforcement
• Anchor bolt design
• Epoxy-coated bars—performance and quality control
• Dapped ends of beams—strut and tie models
• T-headed bars
• Use of precast panels for bridge decks
– Elimination of thickened ends
– Skewed bridges
• Repair and strengthening of bridge girders
– Damage from over-height loads
– Use of CFRP for strengthening
5. Development and splices of
reinforcement
• 1960’s
– Ferguson began work on development and use of large
bars
• 1970’s and 80’s
– Reevaluation of data
– Tests on wall-type specimens,
– Effects of Casting position, Consolidation and
superplasiticizers, Impact loading, Interaction with shear
• 1990’s
– Bundled bars
– Headed bars
6. Why was this research important?
• Greatly improved understanding of bond
because the tests were large scale
• Provided data that led to major changes in
bridge and building codes
• Findings were incorporated into the TxDOT
Design Manuals
• Gained national and international attention
for TxDOT research program
7. Anchor Bolts
• First work in 1977 resulted in a design equation that was
widely used because there was no other guidance.
8. • In 2007, the behavior of anchor bolts in ASR/DEF
damaged drilled shafts was studied
• Design codes now contain guidance for a large
variety of cases involving anchorages in concrete
9. Bridge Decks
• The use of precast, prestressed concrete (PC)
panels for stay-in-place formwork presented a
difficult construction detail at expansion
13. Results
• Thickened slab not needed so panels could be
placed at expansion joints
• Formwork at joints no longer needed leading
to a safer work environment
• Expansion joint hardware could be placed in
topping slab
• Punching shear and
flexural capacity of
deck at edge was
much greater than
expected loads
14. Materials
• Epoxy-coated bars for durability
• High-strength concretes and effects of additives
• Fiber and alloy steels in corrosive environments
• Higher strength steels—80 to 100ksi bars are
being studied and will likely be permitted in
codes in the near future
• Materials for life extension--FRP’s, coatings,
chemical treatments
15. Structural Repair and Strengthening
• Similar damage to railroad bridge over Steck Ave. in Austin
• Damaged girder brought to Ferguson Lab for evaluation;
repair of severed tendons; and replacement of damaged
concrete
Damage to Waelder
Bridge over I-10 due to
over-height load
Damage to Waelder Bridge over I-10
due to over-height load
16. Structural Repair and Strengthening
• For increased truck traffic and loadings
• Use of CFRP materials for improving shear
strength of bridge girders
• Combination of CFRP sheets and CFRP anchors
can be used for I and T sections where
complete wrapping is not possible
17.
18. Other topics
• Fatigue studies of steel bridge girders and
illumination poles
• Stability of steel girder superstructures
• Bolted and welded connections
• Behavior of elastomeric bearing pads
• Stability of concrete arches—Fort Worth
19. Impact
• Viewed as leader among states in supporting
research that changed bridge design and
construction practice
• Influenced structural bridge and building
codes worldwide
• Provided training for a cadre of
knowledgeable engineers who became
leaders in the structural engineering
profession
20. Recognition
• Charles S. Whitney Award 1980 from ACI for
noteworthy engineering development work in
concrete design or construction
• Alfred E. Lindau Award 2005 from ACI for
outstanding contributions to reinforced concrete
design practice
• Citations for outstanding individual bridge
projects
• Numerous awards for technical papers based on
TxDOT-sponsored projects
21. Personal Reflections
• TxDOT Research Program
– Cooperation
– Collaboration
– Implementation
• The most rewarding research of my career
• Played a pivotal role in the development of Civil
Engineering at the University of Texas and in the
State of Texas
THANK YOU FOR THESE OPPORTUNITIES