The document discusses two case studies of structural strengthening projects:
1) The restoration of the historic Jiangwan Stadium in China from 1935, which involved carbonation rehabilitation, steel truss repairs, surface repairs, crack solutions, filler wall strengthening, and reinforced concrete flexural member strengthening.
2) Strengthening of a 14-story reinforced concrete building in Mexico City damaged in earthquakes, including adding steel bracing, jacketing beams and columns, reinforced concrete walls, and new foundation piles. Both case studies highlight understanding damage causes and ensuring load paths in rehabilitation designs.
The document discusses slip form construction, a method where concrete is poured into a continuously moving form. There are two main types - vertical forms that move upwards, and horizontal forms that move horizontally. Slip forming allows for continuous, jointless concrete structures and reduces construction time compared to traditional formwork. It requires careful planning of the construction process to achieve high productivity while ensuring safety.
This document discusses retrofitting of structures. Retrofitting is required when structures are damaged or do not meet current seismic standards. It summarizes various retrofitting techniques such as adding shear walls, infill walls, steel bracing, wall thickening, wing walls, mass reduction, base isolation, and jacketing structural elements. It provides examples of existing retrofitted structures in Gujarat. Retrofitting increases strength and ductility but can reduce space and increase foundation loads. Materials discussed include steel, fiber reinforced polymer, and reinforced concrete.
Retrofitting case study of RCC structureManish Sharma
This document discusses several case studies of seismic retrofitting techniques used to improve the performance of vulnerable or earthquake damaged reinforced concrete buildings. It describes the features and damage observed in five buildings from earthquakes in Mexico and Turkey. For each building, it outlines the retrofitting techniques employed such as adding concrete shear walls, bracing, jacketing of columns and beams, and infilling frame bays with shear walls. The expected performance of the retrofitted buildings, based on analytical modeling, was improved seismic resistance and reduced vibration periods.
1) High rise buildings are becoming more common due to scarcity of land and demand for space. They are defined differently but generally refer to buildings over 15 meters tall.
2) Foundations for high rise buildings include shallow foundations like spread footings and mat foundations, and deep foundations like piles. Piles transfer load through end bearing or friction along their length.
3) Structural systems for high rise buildings must resist both gravity and lateral loads. Interior systems include rigid frames and shear walls. Exterior systems such as tube and diagrid systems resist loads along the building perimeter.
Concrete jacketing or retrofitting is a procedure to increase the strength of existing structures by modifying them. It makes structures more resistant to seismic activity, ground motion, and soil failure from earthquakes. Some purposes of jacketing are to increase concrete confinement, shear strength, and flexural strength through the use of transverse and longitudinal fiber reinforcement. Retrofitting reduces vulnerability to earthquake damage by strengthening structures to current seismic codes. The process involves assessing structural condition, evaluating seismic forces, selecting retrofit strategies, and construction.
This document discusses steel grillage foundations. It begins by defining a steel grillage foundation as a type of shallow foundation used for heavily loaded steel columns where soil bearing capacity is poor. It is constructed using steel beams arranged in two or more tiers at right angles. The document then describes the construction process which involves laying beams on a concrete bed, pouring concrete between them, and attaching columns using base plates. Precautions like minimum depths and gaps are also outlined. Diagrams of the plan, elevation, and elements are included.
The document discusses precast concrete construction. Some key points:
- Precast concrete components are cast off-site in a controlled environment and transported to the construction site for assembly. This allows for standardized, mass produced elements.
- Large precast concrete panels form the walls and floors, connecting vertically and horizontally. When joined, they form a rigid box structure that transfers lateral loads.
- Connections between precast elements can be either dry joints using bolts/welds, or monolithic placement with concrete poured to join components.
The document discusses slip form construction, a method where concrete is poured into a continuously moving form. There are two main types - vertical forms that move upwards, and horizontal forms that move horizontally. Slip forming allows for continuous, jointless concrete structures and reduces construction time compared to traditional formwork. It requires careful planning of the construction process to achieve high productivity while ensuring safety.
This document discusses retrofitting of structures. Retrofitting is required when structures are damaged or do not meet current seismic standards. It summarizes various retrofitting techniques such as adding shear walls, infill walls, steel bracing, wall thickening, wing walls, mass reduction, base isolation, and jacketing structural elements. It provides examples of existing retrofitted structures in Gujarat. Retrofitting increases strength and ductility but can reduce space and increase foundation loads. Materials discussed include steel, fiber reinforced polymer, and reinforced concrete.
Retrofitting case study of RCC structureManish Sharma
This document discusses several case studies of seismic retrofitting techniques used to improve the performance of vulnerable or earthquake damaged reinforced concrete buildings. It describes the features and damage observed in five buildings from earthquakes in Mexico and Turkey. For each building, it outlines the retrofitting techniques employed such as adding concrete shear walls, bracing, jacketing of columns and beams, and infilling frame bays with shear walls. The expected performance of the retrofitted buildings, based on analytical modeling, was improved seismic resistance and reduced vibration periods.
1) High rise buildings are becoming more common due to scarcity of land and demand for space. They are defined differently but generally refer to buildings over 15 meters tall.
2) Foundations for high rise buildings include shallow foundations like spread footings and mat foundations, and deep foundations like piles. Piles transfer load through end bearing or friction along their length.
3) Structural systems for high rise buildings must resist both gravity and lateral loads. Interior systems include rigid frames and shear walls. Exterior systems such as tube and diagrid systems resist loads along the building perimeter.
Concrete jacketing or retrofitting is a procedure to increase the strength of existing structures by modifying them. It makes structures more resistant to seismic activity, ground motion, and soil failure from earthquakes. Some purposes of jacketing are to increase concrete confinement, shear strength, and flexural strength through the use of transverse and longitudinal fiber reinforcement. Retrofitting reduces vulnerability to earthquake damage by strengthening structures to current seismic codes. The process involves assessing structural condition, evaluating seismic forces, selecting retrofit strategies, and construction.
This document discusses steel grillage foundations. It begins by defining a steel grillage foundation as a type of shallow foundation used for heavily loaded steel columns where soil bearing capacity is poor. It is constructed using steel beams arranged in two or more tiers at right angles. The document then describes the construction process which involves laying beams on a concrete bed, pouring concrete between them, and attaching columns using base plates. Precautions like minimum depths and gaps are also outlined. Diagrams of the plan, elevation, and elements are included.
The document discusses precast concrete construction. Some key points:
- Precast concrete components are cast off-site in a controlled environment and transported to the construction site for assembly. This allows for standardized, mass produced elements.
- Large precast concrete panels form the walls and floors, connecting vertically and horizontally. When joined, they form a rigid box structure that transfers lateral loads.
- Connections between precast elements can be either dry joints using bolts/welds, or monolithic placement with concrete poured to join components.
This document reviews the feasibility of using modular construction techniques for hotel, housing, and worker accommodation developments. Modular construction involves factory production of prefabricated rooms or units that are assembled on site. Key benefits include short construction time, high quality control, reliable timescales, and price certainty. Modular construction works best for repetitive building types, where scheduling is tight, and quality is important. It can provide durable buildings with acoustic and thermal insulation that meet building regulations.
Curtain walls are non-load bearing exterior walls that hang from the building structure. They allow for larger windows and more open floor plans compared to load bearing walls. Common materials for curtain walls are glass and aluminum due to their strength, light weight, and ability to limit heat transfer. Curtain walls are classified based on their method of construction, with common types being stick wall, unitized wall, and window wall systems. Proper design of curtain wall systems is important to handle loads, transfers stresses to the building structure, and prevents air and water infiltration.
Pre-stressed concrete uses tensioned steel strands or bars to place concrete in compression before application of service loads. This counters the tensile stresses induced by loads and prevents cracking. There are two main methods: pre-tensioning applies tension before pouring concrete, while post-tensioning tensions strands after concrete curing. Pre-stressed concrete allows for smaller and lighter structures that resist loads, deflection, and cracking better than reinforced concrete.
This document summarizes earthquake resistant techniques. It discusses conventional methods like strengthening buildings through stiffness and ductility. Advanced methods of base isolation and energy dissipation devices are explained. Case studies on buildings like Torre Mayor and Transamerica Pyramid are provided. Techniques under research like shape memory alloys, mussel fibers, visco-elastic dampers and rubber cloaking are outlined. Seismic zones and codes in India are briefly covered along with references.
This presentation discusses prefabricated building components. It covers prefabrication systems including large panel systems, frame systems, and slab-column systems. Manufacturing processes are described for various components like roof slabs, floor slabs, waffle slabs, wall panels, shear walls, beams, and columns. Specific component types like floor slabs, waffle slabs, wall panels, and shear walls are explained in more detail. Architectural and structural design aspects of using prefabricated components are also addressed.
Ferrocement is a thin reinforced concrete made of wire mesh and cement mortar. It was introduced in 1943 and offers high strength and flexibility compared to conventional concrete. Ferrocement consists of thin layers of wire mesh embedded in and covered by a sand-cement mortar mix, with a typical ratio of 5% wire mesh to 95% mortar. It can be formed into various shapes by hand or machine and has applications in construction, agriculture, transportation and more due to its strength, versatility and affordability.
minor project report on design of residential buildingtushar garg
This document is a minor project report submitted by Tushar Garg to Rajendra Kumar Khyalia for a Bachelor of Technology degree. It includes an acknowledgement, abstract, declaration, and table of contents sections. The content covers the aim of designing a residential building, including selecting a plot, surveying the site, requirements for residential buildings, building bye laws and regulations, room arrangements, and sanitation provisions. Drawings and photos are also included.
Reinforced concrete columns and beams are important structural elements that carry compressive and bending loads respectively. Columns can be categorized as short or long based on their height-width ratio and as spiral or tied columns based on their shape. Beams are classified based on their supports as simply supported, fixed, continuous, or cantilever beams. The construction of RCC columns and beams involves laying reinforcement, forming the structure, and pouring concrete to create these load-bearing elements.
Grillage foundation is used for structures requiring heavy loads to be distributed over a large, shallow foundation area. It consists of steel beams arranged in two or more tiers at right angles to spread the load. This allows for transferring load to poorer soils while limiting excavation depth to 1-1.5 meters. The beams are embedded in concrete and connected together to form a rigid foundation mat that distributes structural loads across a wide subsoil area.
Structural systems in high rise building and analysis methodsDP NITHIN
This presentation is about the structural systems in tall buildings and also consists of overview of methods of analysis in tall buildings like linear and non linear seismic analysis.
This document discusses prefabrication systems and their advantages. It defines prefabrication as assembling building components in a factory and transporting them to the construction site. Prefabrication can reduce construction costs by 30%, time by 35%, and defects by 60% compared to traditional methods. It also lists principles of prefabrication like designing for modularity, simplifying connections, and minimizing materials. Prefabrication is described as more efficient, lower cost, and reducing waste and manpower compared to conventional construction. Examples of prefabricated building elements like walls, roofs, and floors are also provided.
The document discusses high rise buildings and their structures. It defines high rise buildings as between 35-100 meters tall or 12-39 floors. Buildings over 100m are called skyscrapers and over 600m are mega-tall. High rises are constructed to address land scarcity in urban areas and increasing demand for space. Their structures have evolved from early stone and iron frames to steel skeleton frames to reinforced concrete shear walls and core structures. Foundations must transfer enormous loads into the ground through methods like raft or pile foundations. Interior structures use rigid frames, shear walls, and exterior structures employ tube systems to resist lateral wind and seismic loads.
Composite structure of concrete and steel.Suhailkhan204
This document discusses composite structures, which combine steel and concrete materials. The key elements of composite structures are composite deck slabs, beams, and columns, along with shear connectors. Composite structures take advantage of concrete's compressive strength and steel's tensile strength. They provide benefits like increased load capacity, stiffness, fire resistance, and cost savings compared to traditional steel or concrete construction alone. An example project, the Millennium Tower in Vienna, is described. The document analyzes costs and concludes that composite structures are best suited for high-rise buildings due to reduced weight, increased ductility, and savings of around 10% compared to reinforced concrete.
The document discusses cracks in buildings, including the types, causes, effects, and methods for repairing cracks. It identifies two main types of cracks: structural cracks that could endanger safety, and non-structural cracks caused by factors like moisture, temperature changes, or chemical reactions. Left unaddressed, cracks can accelerate concrete deterioration and carbonation, compromise waterproofing, and affect building appearance and durability. The document outlines various techniques for repairing cracks, such as epoxy injection, routing and sealing, stitching, drilling and plugging, and gravity filling. It emphasizes the importance of both preventing cracks and properly repairing existing cracks to maintain building integrity.
Pre-engineered buildings are factory-built steel structures that are shipped to sites in pieces and bolted together for quick assembly. They are rectangular structures enclosed in corrugated metal sheeting. PEB construction is fast because foundations are poured while factory fabrication occurs. PEBs have primary and secondary structural elements, roof/wall panels, and accessories. They provide benefits like reduced construction time, lower costs, flexibility for expansion, large clear spans, quality control, and energy efficiency. However, they also have disadvantages like corrosion sensitivity, added insulation costs, and limited design customization. PEBs are commonly used for warehouses, factories, workshops, and other industrial and commercial buildings.
Composite construction or Composite Structure/FrameAbdul Rahman
Composite structure of steel and concrete has been explained under this ppt with examples, type of structural members, advantages and comparison with other structures like R.C.C structure and Steel structures.
Seismic Retrofitting of RC Buildingwith Jacketing and Shear Wall Seismic Ret...Bala murali
It is a part of retrofitting i.e. repair, renovation, strengthening.
Retrofitting is the modification of existing structures to make them more resistant.
Jacketing is the most popularly used method for strengthening of building columns.
Jacketing consists of added concrete with longitudinal and transverse reinforcement around the existing column.
It improves axial and shear strength of column and major strengthening of foundation may be avoided.
Final paper for thesis on Steel tubular columnAL AMIN AZIZ
This thesis paper was completed by myself at the time of my Graduation in Civil Engineering from RUET. I am now publishing this paper so that it could help someone and they can run the further implementation of the future scope of this paper.
This document reviews the feasibility of using modular construction techniques for hotel, housing, and worker accommodation developments. Modular construction involves factory production of prefabricated rooms or units that are assembled on site. Key benefits include short construction time, high quality control, reliable timescales, and price certainty. Modular construction works best for repetitive building types, where scheduling is tight, and quality is important. It can provide durable buildings with acoustic and thermal insulation that meet building regulations.
Curtain walls are non-load bearing exterior walls that hang from the building structure. They allow for larger windows and more open floor plans compared to load bearing walls. Common materials for curtain walls are glass and aluminum due to their strength, light weight, and ability to limit heat transfer. Curtain walls are classified based on their method of construction, with common types being stick wall, unitized wall, and window wall systems. Proper design of curtain wall systems is important to handle loads, transfers stresses to the building structure, and prevents air and water infiltration.
Pre-stressed concrete uses tensioned steel strands or bars to place concrete in compression before application of service loads. This counters the tensile stresses induced by loads and prevents cracking. There are two main methods: pre-tensioning applies tension before pouring concrete, while post-tensioning tensions strands after concrete curing. Pre-stressed concrete allows for smaller and lighter structures that resist loads, deflection, and cracking better than reinforced concrete.
This document summarizes earthquake resistant techniques. It discusses conventional methods like strengthening buildings through stiffness and ductility. Advanced methods of base isolation and energy dissipation devices are explained. Case studies on buildings like Torre Mayor and Transamerica Pyramid are provided. Techniques under research like shape memory alloys, mussel fibers, visco-elastic dampers and rubber cloaking are outlined. Seismic zones and codes in India are briefly covered along with references.
This presentation discusses prefabricated building components. It covers prefabrication systems including large panel systems, frame systems, and slab-column systems. Manufacturing processes are described for various components like roof slabs, floor slabs, waffle slabs, wall panels, shear walls, beams, and columns. Specific component types like floor slabs, waffle slabs, wall panels, and shear walls are explained in more detail. Architectural and structural design aspects of using prefabricated components are also addressed.
Ferrocement is a thin reinforced concrete made of wire mesh and cement mortar. It was introduced in 1943 and offers high strength and flexibility compared to conventional concrete. Ferrocement consists of thin layers of wire mesh embedded in and covered by a sand-cement mortar mix, with a typical ratio of 5% wire mesh to 95% mortar. It can be formed into various shapes by hand or machine and has applications in construction, agriculture, transportation and more due to its strength, versatility and affordability.
minor project report on design of residential buildingtushar garg
This document is a minor project report submitted by Tushar Garg to Rajendra Kumar Khyalia for a Bachelor of Technology degree. It includes an acknowledgement, abstract, declaration, and table of contents sections. The content covers the aim of designing a residential building, including selecting a plot, surveying the site, requirements for residential buildings, building bye laws and regulations, room arrangements, and sanitation provisions. Drawings and photos are also included.
Reinforced concrete columns and beams are important structural elements that carry compressive and bending loads respectively. Columns can be categorized as short or long based on their height-width ratio and as spiral or tied columns based on their shape. Beams are classified based on their supports as simply supported, fixed, continuous, or cantilever beams. The construction of RCC columns and beams involves laying reinforcement, forming the structure, and pouring concrete to create these load-bearing elements.
Grillage foundation is used for structures requiring heavy loads to be distributed over a large, shallow foundation area. It consists of steel beams arranged in two or more tiers at right angles to spread the load. This allows for transferring load to poorer soils while limiting excavation depth to 1-1.5 meters. The beams are embedded in concrete and connected together to form a rigid foundation mat that distributes structural loads across a wide subsoil area.
Structural systems in high rise building and analysis methodsDP NITHIN
This presentation is about the structural systems in tall buildings and also consists of overview of methods of analysis in tall buildings like linear and non linear seismic analysis.
This document discusses prefabrication systems and their advantages. It defines prefabrication as assembling building components in a factory and transporting them to the construction site. Prefabrication can reduce construction costs by 30%, time by 35%, and defects by 60% compared to traditional methods. It also lists principles of prefabrication like designing for modularity, simplifying connections, and minimizing materials. Prefabrication is described as more efficient, lower cost, and reducing waste and manpower compared to conventional construction. Examples of prefabricated building elements like walls, roofs, and floors are also provided.
The document discusses high rise buildings and their structures. It defines high rise buildings as between 35-100 meters tall or 12-39 floors. Buildings over 100m are called skyscrapers and over 600m are mega-tall. High rises are constructed to address land scarcity in urban areas and increasing demand for space. Their structures have evolved from early stone and iron frames to steel skeleton frames to reinforced concrete shear walls and core structures. Foundations must transfer enormous loads into the ground through methods like raft or pile foundations. Interior structures use rigid frames, shear walls, and exterior structures employ tube systems to resist lateral wind and seismic loads.
Composite structure of concrete and steel.Suhailkhan204
This document discusses composite structures, which combine steel and concrete materials. The key elements of composite structures are composite deck slabs, beams, and columns, along with shear connectors. Composite structures take advantage of concrete's compressive strength and steel's tensile strength. They provide benefits like increased load capacity, stiffness, fire resistance, and cost savings compared to traditional steel or concrete construction alone. An example project, the Millennium Tower in Vienna, is described. The document analyzes costs and concludes that composite structures are best suited for high-rise buildings due to reduced weight, increased ductility, and savings of around 10% compared to reinforced concrete.
The document discusses cracks in buildings, including the types, causes, effects, and methods for repairing cracks. It identifies two main types of cracks: structural cracks that could endanger safety, and non-structural cracks caused by factors like moisture, temperature changes, or chemical reactions. Left unaddressed, cracks can accelerate concrete deterioration and carbonation, compromise waterproofing, and affect building appearance and durability. The document outlines various techniques for repairing cracks, such as epoxy injection, routing and sealing, stitching, drilling and plugging, and gravity filling. It emphasizes the importance of both preventing cracks and properly repairing existing cracks to maintain building integrity.
Pre-engineered buildings are factory-built steel structures that are shipped to sites in pieces and bolted together for quick assembly. They are rectangular structures enclosed in corrugated metal sheeting. PEB construction is fast because foundations are poured while factory fabrication occurs. PEBs have primary and secondary structural elements, roof/wall panels, and accessories. They provide benefits like reduced construction time, lower costs, flexibility for expansion, large clear spans, quality control, and energy efficiency. However, they also have disadvantages like corrosion sensitivity, added insulation costs, and limited design customization. PEBs are commonly used for warehouses, factories, workshops, and other industrial and commercial buildings.
Composite construction or Composite Structure/FrameAbdul Rahman
Composite structure of steel and concrete has been explained under this ppt with examples, type of structural members, advantages and comparison with other structures like R.C.C structure and Steel structures.
Seismic Retrofitting of RC Buildingwith Jacketing and Shear Wall Seismic Ret...Bala murali
It is a part of retrofitting i.e. repair, renovation, strengthening.
Retrofitting is the modification of existing structures to make them more resistant.
Jacketing is the most popularly used method for strengthening of building columns.
Jacketing consists of added concrete with longitudinal and transverse reinforcement around the existing column.
It improves axial and shear strength of column and major strengthening of foundation may be avoided.
Final paper for thesis on Steel tubular columnAL AMIN AZIZ
This thesis paper was completed by myself at the time of my Graduation in Civil Engineering from RUET. I am now publishing this paper so that it could help someone and they can run the further implementation of the future scope of this paper.
The document provides details about the Structural Design and Drawing course CE8703 taught at Vivekanandha College of Technology for Women. It includes the course objectives, units covered, outcomes, design and drawing exercises, textbooks and code books referenced. The key topics covered in the course are design and drawing of retaining walls, flat slabs, bridges, liquid storage structures, industrial structures, girders and connections. The course aims to provide students with knowledge of structural engineering design principles and skills to design and draw various reinforced concrete and steel structures.
This document provides an introduction and literature review on concrete filled steel tube (CFST) columns. Some key points:
1) CFST columns utilize the advantages of both steel and concrete by using a steel hollow section filled with concrete. They are widely used in building construction.
2) Previous research has shown CFST columns have improved structural performance due to confinement of the concrete core by the steel tube. They also have construction advantages due to their simple erection sequence.
3) The literature review covers the behavior of CFST under different load cases like axial, bending, and combined loads. It also discusses design concepts, analytical methods, and codes/standards for CFST columns.
The document provides details about three case studies involving cast-in-place concrete construction:
The first case study describes the construction of a bridge over the Iowa River using launching methods to avoid environmental impacts. Segments were precast and then launched into place from behind an abutment.
The second case study discusses the Stoney Trail Bridge in Calgary, the second incrementally launched concrete bridge built in North America. Its 19 segments were cast on one bank and then jacked horizontally into position atop 30m high piers.
The third case study gives structural details of a bridge with a 102m main span constructed using curved, post-tensioned segmental concrete placed by lifting and sliding segments with hydraulic jacks
The document discusses methods for strengthening structural members like beams and slabs that have insufficient strength. For beams, additional reinforcement can be added on the bottom and sides, and bonded with epoxy. For slabs, a reinforced concrete topping can be applied to create a composite section with the existing slab, using mechanical anchors and epoxy bonding. Proper preparation of surfaces, curing, and controlling deflection during strengthening are emphasized.
The Structural Behaviour of Concrete Filled Steel Tubular columnsIRJET Journal
This document describes a study comparing the structural behavior of concrete-filled steel tubular columns made with different steel materials through numerical analysis and experimental testing. Six column specimens were tested - two each made with stainless steel, mild steel, and cold-formed steel tubes. Both short and long columns were analyzed. The numerical analysis found that stainless steel columns had the highest load-carrying capacity. The experimental results supported this, with stainless steel columns outperforming the other materials. There was good agreement between the numerical and experimental load values, with errors generally below 5%. The study concluded that stainless steel provided the best performance for concrete-filled steel tubular columns subjected to axial loads.
This document discusses the use of steel in buildings and provides details on three specific structures:
1. The Hearst Tower features a diagrid steel frame that saves 20% of steel and allows for an open interior floorplan. Over 90% of its steel is recycled.
2. HL23 is a residential tower with a custom stainless steel and glass curtain wall. It employs a reverse-tapering shape to maximize floorspace within its small footprint.
3. Burj Al Arab hotel is designed to resemble a ship sail. It has an exoskeleton steel frame and truss system to transfer loads to the central spine and foundation.
This document discusses steel-concrete composite construction. It describes shear connectors, which provide composite action between steel beams and concrete slabs. There are three main types of shear connectors: rigid connectors made of steel bars or angles that resist shear through bearing pressure; flexible stud connectors that bend and fail through yielding; and bond-type connectors that rely on bond and anchoring. The document discusses the design of shear connectors according to Indian codes IRC 22-1986 and IS 11384-1985, providing methods to calculate the design strength of shear connectors.
Seismic rehabilitation of beam column joint using gfrp sheets-2002Yara Mouna
The document summarizes a study that tested different rehabilitation techniques for improving the seismic performance of reinforced concrete beam-column joints. Three beam-column joints were tested: a control specimen and two specimens that were rehabilitated using glass fiber-reinforced polymer (GFRP) sheets. The control specimen failed in a brittle shear and bond failure mode, while the rehabilitated specimens exhibited a more ductile flexural failure of the beam. The rehabilitation techniques strengthened the joint shear capacity and prevented bond-slip failures of the beam reinforcement in the joint. A simple design methodology for the GFRP rehabilitation is proposed.
Seismic rehabilitation of beam column joint using gfrp sheets-2002Yara Mouna
The document describes a study that tested three beam-column joints to evaluate seismic rehabilitation techniques. A control specimen showed brittle joint shear and bond failure, while two specimens rehabilitated with glass fiber reinforced polymer sheets showed more ductile failure by flexural hinging in the beam. One rehabilitated specimen used GFRP sheets wrapped around the joint and anchored with steel plates to strengthen shear capacity. The other used additional GFRP sheets attached to the bottom of the beam to strengthen bond capacity of the reinforcement bars. Both rehabilitation schemes improved behavior by eliminating brittle joint failures and increasing ductility.
This document discusses repairs made to an old building located in Sullia, India that was experiencing structural issues due to water damage. Inspections found cracks in walls and ceilings, corrosion of reinforcement, and water leaks. Repair methods included tracing and repairing cracks with mortar and grout, strengthening columns with steel jacketing, repairing reinforced concrete, and replastering and coating external walls. The repairs addressed water damage issues and strengthened the structure so it could support an additional floor.
This document discusses prestressed concrete, which uses tensioned steel cables or bars to put concrete members into compression and increase their strength. It describes three main methods: pre-tensioned concrete where the steel is tensioned before the concrete is cast; bonded post-tensioned concrete where steel is tensioned after casting to compress the concrete; and unbonded post-tensioned concrete where greased steel is used to allow individual adjustment. Applications include buildings, bridges, nuclear reactors and earthquake resistant structures. Advantages are lower costs, thinner members, and increased spans.
Reinforced cement concrete (RCC) is a composite material made of cement concrete reinforced with steel bars. Some key points:
- François Coignet built the first reinforced concrete structure, a four story house in Paris in 1853.
- RCC is used in the construction of columns, beams, footings, slabs, dams, water tanks, tunnels, bridges, walls and towers due to its high strength and durability.
- The steel reinforcement provides tensile strength, while the concrete primarily resists compressive forces and protects the steel from corrosion. Together they form a very strong, stable structural material.
This document discusses retrofitting of buildings. It begins with an introduction to retrofitting, which is defined as modifying existing structural members to increase resistance to loads. The document then covers the goals of retrofitting such as increasing lateral strength and ductility. It also discusses the need for retrofitting, including when buildings are not designed to code or seismic zones are upgraded. The stages of retrofitting and methods for assessing building condition are outlined. Common retrofitting techniques like concrete and steel jacketing are described and examples of retrofitted structures in Balochistan are provided.
The aim of strengthening is to increase the capacity of an existing structural element.
Strengthening can be achieved by; Replacing poor quality or defective material Attaching additional load-bearing material Redistribution of the loading actions
The document provides information about a course on reinforced concrete structures design and drawing. The course aims to introduce students to limit state design concepts and impart knowledge on designing structural elements like slabs, beams, and columns. The course outline details the various units that will be covered, including introduction to limit state design methodology, design of beams, shear and torsion, slab design, column design, and footing design.
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.
Seismic retrofitting of heritage building- case studyashlinvilson
The Mani Mandir complex (100m×100m in plan) is an important historic monument of the town of Morbi
in the western state of Gujarat, which suffered significant damage during the M7.7 Bhuj earthquake of
2001 in India. As part of the earthquake reconstruction program, the Government of Gujarat decided to
seismically retrofit this complex. The project was divided into two phases of design and execution; this
paper discusses the evaluation and design procedures recommended for exeuction. A detailed condition
survey was carried out and measured drawings were prepared. A comprehensive retrofit program was
formulated. Conservation principles, minimum intervention and consonance with the heritage character of
the building were important considerations in selecting the retrofit program. The complex was modeled
using finite elements and behaviour was studied of the existing structure as well as retrofit structure. The
retrofit measures recommended included discriminate use of internal reinforced concrete skin walls,
providing a rigid diaphragm behaviour mechanism in existing slabs, introducing stainless steel
reinforcement bands in the existing masonry walls, cross-pinning and end-pinning in walls and pillars,
and strengthening of arches and elevation features.
Similar to Case studies for strengthening of existing structures (20)
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.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
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Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
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IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
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Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
2. Structural strengthening is the process of upgrading structures to improve
performance under existing loads or to increase the strength
of structural members to carry additional loads.
Two case studies are discussed
1. A case study on the restoration and strengthening of a historic stadium in
china
2. Case studies of strengthening of existing reinforced concrete building in
Mexico city
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3. The Jiangwan Stadium, which is a Municipal Level Cultural Relic Preservation
Site in Shanghai, was built up in 1935.
The structure members were deteriorating with aging although they were
repaired for several times.
There are some defects in the structure members, such as:
1. severe carbonation of concrete;
2. corrosion of steel rebar and
3. breakdown of concrete coverage.
In order to eliminate these defects and make it a safe state of the structure, the
relative solutions are adopted.
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4. Jiangwan Stadium is approximately 28000 square meters in area, and it was the
biggest and most well-found stadium in Far East area when it was built up.
Jiangwan Stadium comprises three fields:
1. Playing field,
2. Gymnasium and
3. Natatorium.
The Playing field is the main part of Jiangwan Stadium. A one-kilometer-long annular
stand forms the body of the playing field.
Natatorium is also a annular architecture, in the middle of which is a 50×20m
swimming pool. The main body of the playing field and the gymnasium are both
reinforced concrete framing structures.
Gymnasium’s stand is also reinforced concrete framing structure, and it has steel truss
structure as roof system, which is separated from the stand’s concrete framing
structure.
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6. In 1930’s, Jiangwan Stadium has suffered from severe derogation by the war.
Although it was repaired for several times, but the structure members were still
deteriorating with aging and weathering during the last 70 years.
For the upgrading of existing Jiangwan Stadium and its surrounding sporting
facilities, a plan named Jiangwan sports park was put forward
Three fields of Jiangwan Stadium were constructed on timber pile-supported
footing, which restricted the non uniform settlement between different sectors
effectively.
Therefore the settlement of three fields remains stable and incline of structure
member is not severe
Strength grading of concrete is very low in general. In several concrete members,
Strength grade of concrete is even lower than C15.
The process of carbonation has developed out of concrete coverage depth in
almost all of beams and columns, which directly led to the accelerative
development of steel rebar’s rusting.
It seems that concrete carbonation and the side effect caused by it occurred more
popular in the hypaethral stand of the playing field
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7. An inspection of the building itself revealed that there were some steel rebar exposed
in the air with breakdown of concrete coverage
obvious vertical cracks were investigated in some beams’ side surface
A conclusion could be drawn that concrete carbonation was the primary cause of
concrete member’s deterioration.
So carbonation rehabilitation should be regarded as the first step and also the most
important step of the concrete member’s repairing work.
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8. Strength grade of sand mortar in the brick wall is very low.
Fortunately, the cracks were almost stable according to site observation.
The filler brick wall hasn’t been connected to the reinforced concrete frame by
tie bars when it was laid.
It seems possible that the filler wall would collapse if earthquake occurs,
especially for the external wall somewhere which has inclined outwards
slightly.
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9. The structure of Gymnasium’s roof is steel truss of three-hinged arch
The whole steel truss structure looks fair
The steel truss structure is still normal in work until now except that few
steel members were deformed by accidental outside force and some
members became corroded slightly.
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10. The techniques used were
Carbonation rehabilitation
Steel truss repairs
Surface repairs
Cracks solution
Filler wall strengthening
Reinforced concrete flexural members strengthening
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11. Carbonation
rehabilitation
To prevent development of concrete
carbonation and corrosion of steel
rebar, corrosion inhibitor is
delivered in a liquid form and
spray-applied over the surface of
concrete members that are subject to
corrosion.
Corrosion inhibitor form a
protective coating over the steel
rebar’s surface, in which steel rebar
is prevent from corrosion and
concrete carbonation is slowed
down
Steel truss repairs
All corroded steel members were
cleaned by abrasive methods, then
corrosion-proof paint were painted all
over the surface.
Few steel member which was deformed
severely by accidental outside force
was taken placed by new section.
Static analysis of steel truss was
carried out and the results showed that
some lower chords of the steel truss
are lack of strength in buckling out
of plane.
In order to strengthen it, two pieces of
longitudinal bracing truss were
added at the relative segment.
The longitudinal bracing truss was
connected to upper and lower chord
of steel roof truss with high strength
bolt . 11
12. Surface repairs
In the surface area where concrete
coverage breakdown was severe,
unsound concrete were removed
entirely.
To the corroded steel rebar exposed
in the air, abrasive method was taken
to clean it, and spreader corrosion
inhibitor all over the surface.
Then high strength mortar was
painted to mend it
Cracks solution
A static load test was carried out in
the site to find the reason why cracks
occurred in some beam’s side
surface.
No development tendency of cracks
was found during the test. It can be
implied that the cracks were brought
out by the temperature stress or the
construction joint due to the fact that
waist steel was absent in the beams.
Therefore the cracks can be considered
stable. Cracks on the surface of
concrete members were sealed by
epoxy resin so that the steel rebar
inside the structure would not
corrode.
To the cracks which were deep and
wide (>0.3mm), grout-injector method
was adopted and epoxy resin was
poured deeply into the cracks by the
use of grout pipe
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13. Filler wall strengthening
Strengthening method of bar-mat and
cement mortar was applied.
Cement mortar surface with steel bar-
mat, was about 35mm in thick, was
attached on the wall’s inner side to
strengthen it.
Steel bar-mat was connected tightly
with both the filler wall and the
concrete columns and beams
Reinforced concrete flexural
members strengthening
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Some beams and slabs are under
reinforced under the service load
according to the existing specification.
To the beams and slabs which were lack
of strength or were deteriorated by the
corrosion of reinforcing steel rebar,
carbon fiber reinforced polymer (CFRP)
wrap system is applied to strengthen
them
14. The restoration and strengthening of Jiangwan Stadium brought the old
architecture an entirely new look and improved the safety degree of the
whole structure.
The application of CFRP system improved the bearing capacity of
flexural members which are lack of strength.
Corrosion inhibitor’s application can restrict the development of steel
rebar’s corrosion.
By the application of the above structural solutions, the safe state of the
structure has been improved remarkably
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15. This case study is on ,One of the building in Mexico city which was subjected to
the 1957 earthquake.
The building is a reinforced concrete structure with fourteen floors and a
basement.
It is a long narrow building (1 bay by 7 bays) with an area approximately 420 m2
per floor
The structure consists of reinforced concrete frames with a solid concrete slab.
The second floor concrete slab is supported by steel beams in both directions.
The foundation is supported by 26 m long piles.
The building is located in the lake bed zone of Mexico City.
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17. In the 1957 earthquake, the building suffered severe structural damage to
the columns.
It was repaired and strengthened by increasing the size of some columns
but without additional reinforcement.
The exterior frame in column line 8 was stiffened with reinforced
concrete braces and masonry infill walls.
The columns at lines 1 and 2 near the elevators suffered severe damage in
all stories. The rest of the columns had lighter damage.
The slab and beams were extensively cracked in all stories.
The partition masonry walls had large cracks. The most damage was in
the two top stories.
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18. Following the 1985 earthquake, a structural review of the building
recommended removal of the two upper levels of the building and
removal of the floor finishes to reduce the weight of all the slabs.
However, it was decided to develop a rehabilitation alternative which
would increase the stiffness of the building without adding excessive
mass or reducing the floor area.
The strengthening approach consisted of installing a steel bracing system
or walls and steel jacketing of beams and columns
18
19. The frame on boundary line “B” which faced an adjacent building was
strengthened with reinforced concrete walls and masonry infill walls
in the five lower levels.
The upper levels were stiffened with steel X-braces between lines 4-5
and 7-8
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20. Frame “A” which faced the street was strengthened with X-braces between
lines 2-3, 4-5 and 6-7 in all the stories
A reinforced concrete wall was added between lines 1 and 2 in all stories.
The new wall was connected to column line 2 with coupling beams
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21. In the short direction in frames 3,4,5 and 6, W-braces were constructed
on alternate floors creating a staggered brace system
21
22. The connections between the braces and beams were made using steel
base plates.
The base plates were bolted to a steel box around the bottom of the beams
The damaged concrete braces and masonry walls in line 8 were
removed and rebuilt increasing the reinforcement in the braces
The masonry infill walls on line 1 were restored without changes.
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23. Columns and beams along column lines 1,2,4,5 were jacketed with steel
elements and connected to the bracing system
The thickness of the slabs was increased with a reinforced concrete
layer over the existing slabs in all floors.
The new slab was attached to the existing slab using 1/2” steel
connectors at 1 m. in both directions
Because of the changes in the superstructure, 56 new piles were added to
the 26 existing piles and new foundation beams were constructed
23
24. The uniqueness of the soil and the dynamic response of structures in Mexico City
were an important factor in the solutions used in the Case Studies and may not be
applicable elsewhere.
Damage studies are vital to design of a rehabilitation scheme.
Causes of damage need to be understood to develop a proper rehabilitation.
Load paths for lateral forces must be clearly and carefully considered in designing
the rehabilitation scheme.
Critical elements in the load path are connections between new and existing
elements location of shear walls and materials used
The strengthening schemes that resulted in the upgrading of the foundations
Foundation modifications are an important economic factor to be considered in the
assessment of a rehabilitation project.
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25. Comprehensive concrete jacketing of columns in medium rise buildings,
with a high density of columns, is a rehabilitation alternative that may not
demand major changes in the foundation.
The addition of shear walls, in most cases, required the addition of piles.
Documentation of rehabilitation projects is needed all over the world so that
when earthquakes strike rehabilitated buildings, performance can be
studied in considerable detail
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26. First case study - Structural Analysis of Historical Constructions by Jia
Zhu and Ming-Zhong Wang (2006)
Second case study - THESIS by JORGE ALFREDO AGUILAR
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