Post Tension
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A Complete Information About the much Awaited Technology that have to increase the use of post tensioning in India
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Post Tensioning Review Session for Installers
Review Session for Post-Tensioning Installers and Inspectors. This is not might to be a training course for certification.
Post Tension
Post-tensioning is an effective alternative for earthquake-prone regions and dense populations in India. It has advantages over ordinary reinforced concrete like higher seismic resilience, less concrete usage, stiffer foundations, and faster construction. Post-tensioning involves threading steel tendons through ducts and tensioning them after concrete pouring. It provides better crack control, economy, quality, and efficiency. While widely used in other countries, post-tensioning is not yet common in India but has applications in slabs, buildings, and foundations.
Post tensioning in building structures
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.
Construction of post tension slab
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.
A Post Tension Primer
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.
Mega prefab post tension catalog
Mega Prefab is a complete service provider of structural precast and post-tensioned concrete. We are involved in all the phases of the project. We will design, manufacture, deliver and install our products. With more than 16 years experience in the business, we have optimized our structural elements to be efficient, safe and low cost.
POST-TENSIONING SYSTEM
The use of post-tensioning system in building offers numerous advantages such as economic savings, minimised floor-to-floor heights, increased column-free space, minimised foundations, in seismic areas, reduced weight and lateral load resisting systems, simplified slab design and construction etc.
Post tension Floor System
Post-tensioning is simply a method of producing prestressed concrete, masonry, and other structural elements. Post-tensioning is a form of prestressing. Prestressing simply means that the steel is stressed (pulled or tensioned) before the concrete has to support the service loads. Most precast, prestressed concrete is actually pre-tensioned-the steel is pulled before the concrete is poured. Post-tensioned concrete means that the concrete is poured and then the tension is applied-but it is still stressed before the loads are applied so it is still prestressed.
Recommended
Post Tensioning Review Session for Installers
Review Session for Post-Tensioning Installers and Inspectors. This is not might to be a training course for certification.
Post Tension
Post-tensioning is an effective alternative for earthquake-prone regions and dense populations in India. It has advantages over ordinary reinforced concrete like higher seismic resilience, less concrete usage, stiffer foundations, and faster construction. Post-tensioning involves threading steel tendons through ducts and tensioning them after concrete pouring. It provides better crack control, economy, quality, and efficiency. While widely used in other countries, post-tensioning is not yet common in India but has applications in slabs, buildings, and foundations.
Post tensioning in building structures
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.
Construction of post tension slab
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.
A Post Tension Primer
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.
Mega prefab post tension catalog
Mega Prefab is a complete service provider of structural precast and post-tensioned concrete. We are involved in all the phases of the project. We will design, manufacture, deliver and install our products. With more than 16 years experience in the business, we have optimized our structural elements to be efficient, safe and low cost.
POST-TENSIONING SYSTEM
The use of post-tensioning system in building offers numerous advantages such as economic savings, minimised floor-to-floor heights, increased column-free space, minimised foundations, in seismic areas, reduced weight and lateral load resisting systems, simplified slab design and construction etc.
Post tension Floor System
Post-tensioning is simply a method of producing prestressed concrete, masonry, and other structural elements. Post-tensioning is a form of prestressing. Prestressing simply means that the steel is stressed (pulled or tensioned) before the concrete has to support the service loads. Most precast, prestressed concrete is actually pre-tensioned-the steel is pulled before the concrete is poured. Post-tensioned concrete means that the concrete is poured and then the tension is applied-but it is still stressed before the loads are applied so it is still prestressed.
What Is Post Tensioning
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
Estimating Systems for Homes1
This document discusses the components and process of estimating the costs for a post-tension slab-on-grade foundation. It covers calculating quantities and costs for excavation, forming, post-tension tendons, concrete, and other materials. Key steps include calculating cubic yards for excavation and concrete, converting square footage of forms to board feet, and taking off post-tension tendons by the linear foot and converting to pounds. Proper concrete mix design, placement, finishing, and curing are also important to consider in the estimate.
What is post tensioning
The document discusses different methods of post-tensioning concrete structures. It describes the Freyssinet system as the first introduced method using steel wires grouped into cables with a helical spring. The Magnel Blaton system stresses wires two at a time using sandwich plates and wedges. The Gifford Udall system uses single wires stressed independently with double-acting jacks and tube or plate anchorages. The Lee McCall system prestresses steel bars using threaded bars tightened with nuts against bearing plates.
One Museum Park West (Post-Tensioning case study)
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
comparison between Post tensioned slab and conventional slab
This document compares post-tensioned slabs and conventional reinforced concrete slabs. Post-tensioned slabs have tendons tensioned after the concrete sets, allowing for thinner slabs that deflect and crack less than reinforced concrete slabs under load. However, post-tensioned slabs require more skilled labor and specialized equipment during construction. Reinforced concrete slabs are simpler to build but thicker and have higher dead loads than equivalent post-tensioned slabs. The document concludes that post-tensioned slabs are generally more economical for large, heavy construction while reinforced concrete slabs are suitable for smaller projects.
Post Tensioning System Utracon Structural system Pvt Ltd
This document discusses the advantages of post-tensioning slabs compared to reinforced concrete slabs. Post-tensioning slabs allows for larger column-free spans, faster floor-to-floor construction times of around 10 days per slab, and thinner slabs which reduce costs and increase seismic resistance. Additional advantages include earlier stripping of formwork below 10 days, reduced reinforcement and materials quantities, fewer workers required, potential for additional floors in height-restricted areas, reduced vertical structure costs, and greater flexibility for services, ceilings, and openings.
5. pre stressed & pre-cast members
This document discusses the concept and principles of pre-stressing concrete. Pre-stressing involves applying compression to reinforced concrete to reduce tensile stresses and prevent cracking. There are two main methods - pre-tensioning where tension is applied before pouring concrete, and post-tensioning where tension is applied after curing. Pre-stressed concrete has advantages like needing less material, being lighter, and resisting corrosion and deflection better than reinforced concrete. However, it is more technically complex and expensive. Common applications include bridges, buildings, water tanks, and offshore platforms.
Introduction to Pre-stressed and Precast Concrete Technology
This the first lecture of prestressed and precast technology. In this lecture overview of prestressed concrete is presented in such a way, that it will be very helpful for civil engineering professionals and students new to the field of prestressed concrete technology.
this lecture covers the following topics
Definition of prestressed and precast concrete
Difference between prestressed and normal reinforced concrete
Terminologies related to prestressed like tendons, Anchorage, Pre-tensioning, post-tensioning, etc
Brief History of prestressed concrete
Development of building materials for prestressed concrete
Advantages and disadvantages of prestressed concrete
Difference between pre-tension and post-tension prestressing.
and Difference between prestressed and precast concrete.
#CivilEngineering #CivilEngineer #Prestressed #Concrete #precast
Facebook Link: https://web.facebook.com/engrshahfarooq
Author Youtube Channel link:
www.youtube.com/c/CivilEngineersite
Pre-stressed Concrete
Pre-stressed concrete uses tensioned steel strands or bars to place concrete in compression and improve its tensile strength. There are two main methods - pre-tensioning and post-tensioning. Pre-tensioning tensions the strands before the concrete is poured, while post-tensioning tensions strands inside ducts after the concrete has cured. This compression counteracts tensile and flexural stresses from loads to reduce cracking and increase strength, allowing pre-stressed concrete to be lighter and more durable than reinforced concrete. It is commonly used in bridges, buildings, tanks, and other structures.
Ppt
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.
Post tension tendon
This document discusses post-tension tendons and methods for inspecting them. Post-tension tendons are steel strands encased in concrete that are tensioned to reinforce large concrete structures. They are susceptible to corrosion over time. Infrastructure Preservation Corporation developed TendonScan, which uses magnetic flux leakage testing technology combined with robotics and interpretation software to inspect external post-tension tendons and provide detailed condition assessments to help with maintenance planning. Magnetic flux leakage testing can detect corrosion and breaks in prestressing strands by measuring changes in the magnetic field caused by defects, but specialized systems calibrated for specific structures are needed to properly interpret the results.
Prestress concrete
this presentation is about prestress concrete structure. this is very effective Technic compare to the reinforcement concrete design.
Shear in prestress concrete
Prestressed concrete is a construction material where internal stresses are introduced to counteract the stresses induced by external loads. There are two main types of prestressing: external prestressing uses tendons on the outside of a concrete section while internal prestressing places tendons inside concrete. Prestressing can also be pre-tensioned, where concrete is cast around pre-stressed tendons, or post-tensioned, where tendons are tensioned after concrete has cured. Different configurations include uniaxial, biaxial, or multi-axial prestressing depending on the direction of prestressing members.
PRESTRESSED CONCRETE
The document provides information on methods of prestressing concrete, including pretensioning and post-tensioning. It discusses:
- Pretensioning involves stressing steel tendons before the concrete is cast around them.
- Post-tensioning involves stressing steel tendons after the concrete has cured using jacks, then grouting the voids.
- Both methods put the concrete in compression and increase its strength and durability compared to conventional reinforced concrete.
Post Tensioning
Post Tensioning: strengthen (reinforced concrete) by applying tension to the reinforcing rods after the concrete has set.
By: Sarchia Khursheed
Post tensioned (PT) slabs
This document provides an overview of post-tensioned concrete slabs. It discusses how PT slabs use high-strength steel strands in tension to compress the concrete and allow for thinner slab thicknesses. This makes PT slabs more efficient and economical compared to reinforced concrete, allowing for longer spans. Examples are given showing how PT slabs offer reductions in material usage, embodied carbon, and cost. Case studies demonstrate real-world applications of PT slab construction.
Prestressed concrete
this presentation is all about prestressing in concrete. Recommended for architecture students or anyone who wishes to know the basics
Final thesis presentation.
This document summarizes research on post-tensioning in buildings. It details the history of post-tensioning from its origins in the 1940s-1950s to its use in the first high-rise building with post-tensioned slabs in 1956. The document then discusses the benefits of post-tensioned slabs and methodology used in the research, including monitoring a construction site. Test results are presented analyzing properties of post-tensioned concrete mixes. The research concludes that post-tensioned slabs provide construction speed and cost benefits compared to reinforced concrete.
Prestress concrete
Prestressed concrete ,post tensioning ,pre tensioning, where normal concrete can not be used and need of more strength is required this type of concrete are used. Metal bars are replaced by the tendoms which are generally used to create tension in concrete. So because of that beam bends in upward direction and when load is applied it come in normal conditon.
Prestressed Concrete
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.
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What Is Post Tensioning
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
Estimating Systems for Homes1
This document discusses the components and process of estimating the costs for a post-tension slab-on-grade foundation. It covers calculating quantities and costs for excavation, forming, post-tension tendons, concrete, and other materials. Key steps include calculating cubic yards for excavation and concrete, converting square footage of forms to board feet, and taking off post-tension tendons by the linear foot and converting to pounds. Proper concrete mix design, placement, finishing, and curing are also important to consider in the estimate.
What is post tensioning
The document discusses different methods of post-tensioning concrete structures. It describes the Freyssinet system as the first introduced method using steel wires grouped into cables with a helical spring. The Magnel Blaton system stresses wires two at a time using sandwich plates and wedges. The Gifford Udall system uses single wires stressed independently with double-acting jacks and tube or plate anchorages. The Lee McCall system prestresses steel bars using threaded bars tightened with nuts against bearing plates.
One Museum Park West (Post-Tensioning case study)
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
comparison between Post tensioned slab and conventional slab
This document compares post-tensioned slabs and conventional reinforced concrete slabs. Post-tensioned slabs have tendons tensioned after the concrete sets, allowing for thinner slabs that deflect and crack less than reinforced concrete slabs under load. However, post-tensioned slabs require more skilled labor and specialized equipment during construction. Reinforced concrete slabs are simpler to build but thicker and have higher dead loads than equivalent post-tensioned slabs. The document concludes that post-tensioned slabs are generally more economical for large, heavy construction while reinforced concrete slabs are suitable for smaller projects.
Post Tensioning System Utracon Structural system Pvt Ltd
This document discusses the advantages of post-tensioning slabs compared to reinforced concrete slabs. Post-tensioning slabs allows for larger column-free spans, faster floor-to-floor construction times of around 10 days per slab, and thinner slabs which reduce costs and increase seismic resistance. Additional advantages include earlier stripping of formwork below 10 days, reduced reinforcement and materials quantities, fewer workers required, potential for additional floors in height-restricted areas, reduced vertical structure costs, and greater flexibility for services, ceilings, and openings.
5. pre stressed & pre-cast members
This document discusses the concept and principles of pre-stressing concrete. Pre-stressing involves applying compression to reinforced concrete to reduce tensile stresses and prevent cracking. There are two main methods - pre-tensioning where tension is applied before pouring concrete, and post-tensioning where tension is applied after curing. Pre-stressed concrete has advantages like needing less material, being lighter, and resisting corrosion and deflection better than reinforced concrete. However, it is more technically complex and expensive. Common applications include bridges, buildings, water tanks, and offshore platforms.
Introduction to Pre-stressed and Precast Concrete Technology
This the first lecture of prestressed and precast technology. In this lecture overview of prestressed concrete is presented in such a way, that it will be very helpful for civil engineering professionals and students new to the field of prestressed concrete technology.
this lecture covers the following topics
Definition of prestressed and precast concrete
Difference between prestressed and normal reinforced concrete
Terminologies related to prestressed like tendons, Anchorage, Pre-tensioning, post-tensioning, etc
Brief History of prestressed concrete
Development of building materials for prestressed concrete
Advantages and disadvantages of prestressed concrete
Difference between pre-tension and post-tension prestressing.
and Difference between prestressed and precast concrete.
#CivilEngineering #CivilEngineer #Prestressed #Concrete #precast
Facebook Link: https://web.facebook.com/engrshahfarooq
Author Youtube Channel link:
www.youtube.com/c/CivilEngineersite
Pre-stressed Concrete
Pre-stressed concrete uses tensioned steel strands or bars to place concrete in compression and improve its tensile strength. There are two main methods - pre-tensioning and post-tensioning. Pre-tensioning tensions the strands before the concrete is poured, while post-tensioning tensions strands inside ducts after the concrete has cured. This compression counteracts tensile and flexural stresses from loads to reduce cracking and increase strength, allowing pre-stressed concrete to be lighter and more durable than reinforced concrete. It is commonly used in bridges, buildings, tanks, and other structures.
Ppt
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.
Post tension tendon
This document discusses post-tension tendons and methods for inspecting them. Post-tension tendons are steel strands encased in concrete that are tensioned to reinforce large concrete structures. They are susceptible to corrosion over time. Infrastructure Preservation Corporation developed TendonScan, which uses magnetic flux leakage testing technology combined with robotics and interpretation software to inspect external post-tension tendons and provide detailed condition assessments to help with maintenance planning. Magnetic flux leakage testing can detect corrosion and breaks in prestressing strands by measuring changes in the magnetic field caused by defects, but specialized systems calibrated for specific structures are needed to properly interpret the results.
Prestress concrete
this presentation is about prestress concrete structure. this is very effective Technic compare to the reinforcement concrete design.
Shear in prestress concrete
Prestressed concrete is a construction material where internal stresses are introduced to counteract the stresses induced by external loads. There are two main types of prestressing: external prestressing uses tendons on the outside of a concrete section while internal prestressing places tendons inside concrete. Prestressing can also be pre-tensioned, where concrete is cast around pre-stressed tendons, or post-tensioned, where tendons are tensioned after concrete has cured. Different configurations include uniaxial, biaxial, or multi-axial prestressing depending on the direction of prestressing members.
PRESTRESSED CONCRETE
The document provides information on methods of prestressing concrete, including pretensioning and post-tensioning. It discusses:
- Pretensioning involves stressing steel tendons before the concrete is cast around them.
- Post-tensioning involves stressing steel tendons after the concrete has cured using jacks, then grouting the voids.
- Both methods put the concrete in compression and increase its strength and durability compared to conventional reinforced concrete.
Post Tensioning
Post Tensioning: strengthen (reinforced concrete) by applying tension to the reinforcing rods after the concrete has set.
By: Sarchia Khursheed
Post tensioned (PT) slabs
This document provides an overview of post-tensioned concrete slabs. It discusses how PT slabs use high-strength steel strands in tension to compress the concrete and allow for thinner slab thicknesses. This makes PT slabs more efficient and economical compared to reinforced concrete, allowing for longer spans. Examples are given showing how PT slabs offer reductions in material usage, embodied carbon, and cost. Case studies demonstrate real-world applications of PT slab construction.
Prestressed concrete
this presentation is all about prestressing in concrete. Recommended for architecture students or anyone who wishes to know the basics
Final thesis presentation.
This document summarizes research on post-tensioning in buildings. It details the history of post-tensioning from its origins in the 1940s-1950s to its use in the first high-rise building with post-tensioned slabs in 1956. The document then discusses the benefits of post-tensioned slabs and methodology used in the research, including monitoring a construction site. Test results are presented analyzing properties of post-tensioned concrete mixes. The research concludes that post-tensioned slabs provide construction speed and cost benefits compared to reinforced concrete.
Prestress concrete
Prestressed concrete ,post tensioning ,pre tensioning, where normal concrete can not be used and need of more strength is required this type of concrete are used. Metal bars are replaced by the tendoms which are generally used to create tension in concrete. So because of that beam bends in upward direction and when load is applied it come in normal conditon.
Prestressed Concrete
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.
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comparison between Post tensioned slab and conventional slab
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Introduction to Pre-stressed and Precast Concrete Technology
Introduction to Pre-stressed and Precast Concrete Technology
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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.
Harshitha_Presentation-3.pptx
This document discusses the retrofitting technique of jacketing columns. It begins by defining retrofitting as modifying a structure after construction to improve amenities or performance. It then discusses various retrofitting techniques, focusing on jacketing. Jacketing involves adding concrete and reinforcement around existing columns to improve axial and flexural strength. The document provides steps for reinforced concrete jacketing of columns for a multi-story building undergoing a three-story expansion. It emphasizes the importance of assessment, redesign, construction oversight, and references further resources on the topic.
REINFORCEMENT CONCRETE chapter 1
This document provides an introduction to reinforced concrete, including its key components and purposes. Reinforced concrete is a composite material made of concrete, which resists compression well but has low tensile strength, and steel reinforcing bars, which resist tension well. Together they create an economical and strong structural material. The document outlines structural elements, design considerations for safety, reliability, and economy, and limit state design principles which ensure structures do not fail under expected loads. It also discusses factors that affect concrete durability and different failure modes in reinforced concrete depending on steel reinforcement ratios.
Prestressing ppt
This document summarizes a presentation on prestressed concrete. It begins with an introduction to prestressed concrete and how it overcomes weaknesses in concrete in tension. It then describes the principles of prestressing by inducing compressive stresses with high-strength tendons before loads are applied. The document compares reinforced concrete with prestressed concrete and describes the methods of pre-tensioning and post-tensioning. It provides examples of prestressed concrete structures like beams, bridges and discusses advantages like reduced size and increased spans as well as disadvantages like higher material costs.
Jacketing
This document discusses column jacketing, which is a method of retrofitting and strengthening existing columns. It involves adding reinforced concrete, steel, or fiber-reinforced polymer around the column. The key steps are preparing the column surface, adding shear keys and reinforcement, applying a bonding agent, and casting the new concrete or installing the jacket. Column jacketing increases the strength and seismic capacity of the column. It improves confinement and increases axial, shear, and foundation load capacity without significant weight addition.
Pt slab design philosophy with slides and pictures showing benefit
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.
Special structure
Tall Structures
Usually structure or building having height more than 80m is considered as a tall structure.
Generally tall structure may be defined as one that because of its height it is affected by lateral.
Classification: 1. Multi storeyedresidential building.
2. Multi storeyedcommercial building.
3. Tall chimneys.
4. Transmission Towers
5. Cooling towers
Prestressed Concrete
•Prestressis defined as a method of applying pre-compression to control the stresses resulting due to external loads below the neutral axis of the beam tension developed due to external load which is more than the permissible limits of the plain concrete.
Demolition
•The action or process of destroying(demolishing)the building or other structures.
•In congested area, in particular, the quality of demolition technique becomes an essential element which determines the success of revitalization of city.
•In addition to efficiency in demolition, strategies must be adopted to avoid noise, vibration and dust which affect the surrounding environment and there must be efficient disposal of waste products
Concrete technology by nihar.pptx
This document provides an overview of concrete technology and design. It discusses the key constituents of concrete, including cement, coarse aggregate, fine aggregate, and water. It also outlines various testing methods for concrete. The document then discusses the Indian Standard Code for concrete design and different design methods, focusing on the limit state method. It describes limit states of collapse and serviceability and how they are applied in design. Finally, it lists some common concrete structures that can be designed using the limit state method according to the Indian Standard Code, and provides references for further reading.
02_Precast-and-Cast-in-Place.ppt
The document discusses precast and cast-in-place concrete construction methods. Precast concrete involves casting structural elements off-site in a controlled environment, then transporting them to the construction site for assembly. Cast-in-place involves pouring concrete directly on-site. Precast offers benefits like faster construction, quality control, and the ability to work independently of weather. However, it requires more joints and handling equipment. Cast-in-place allows for monolithic structures but offers less construction speed and quality control. Both methods have advantages depending on the size and needs of the specific project.
the kajima cut and take down method
The document describes the Kajima Cut and Take Down (KC&TD) demolition method developed by Kajima Corporation. The method involves dismantling tall buildings from the bottom up using hydraulic jacks, one floor at a time, inspired by the Japanese toy Daruma Otoshi. Key steps include installing temporary support columns, using hydraulic jacks to lower each floor, and demolishing floors and walls from the ground level. The method generates less dust, noise and risk compared to conventional demolition and allows for higher recycling rates. It was used to dismantle Kajima Corporation's headquarters towers.
Construction portfolio (manvi)
This document discusses the design of the Punjab Kesari Headquarters building in Delhi, India. Key points include:
- The building fuses traditional Indian architecture with a contemporary office design, using an animated facade and central atrium to optimize natural light and ventilation.
- Sustainability is a core focus, with the atrium and facade design reducing heat gain and reliance on artificial lighting.
- Digital simulations were used during design to achieve adequate natural light levels throughout the building without mechanical lighting.
- Additional simulations explored using the atrium and inlet/outlet placements to improve natural ventilation and thermal comfort on hot days.
Retaining wall (1)
This document discusses a group assignment for a Construction Technology III class. The group members are listed and their assignment is to design a retaining wall. Several types of retaining walls are described, including gravity, semi-gravity, and reinforced walls. Considerations for constructing a retaining wall include time, budget, size, slope, and drainage. Two case studies of retaining wall projects are provided, one using a soil nailing technique and the other featuring precast concrete blocks.
26901321007_SAPTADEEP DASGUPTA_CE(PE)702A.pdf
This document provides information about prestressed concrete, specifically focusing on post-tensioning methods. It defines post-tensioning as a method of reinforcing concrete with high-strength steel strands called tendons. After the concrete cures, the tendons are tensioned using hydraulic jacks and wedged into place to transfer pressure to the concrete. There are benefits to post-tensioning like allowing longer spans, thinner structures, and reduced cracking compared to conventional reinforced concrete. The document discusses bonded and unbonded post-tensioning methods and provides examples of applications like buildings, bridges, and parking structures.
RETROFITTING OF CONCRETE STRUCTURE
This document discusses various techniques for retrofitting concrete structures to make them more resistant to seismic activity and other natural hazards. It defines retrofitting as modifying existing structures to increase resistance. Key techniques mentioned include adding new shear walls, steel bracing, column and beam jacketing with steel or concrete, base isolation using seismic isolators, mass reduction by removing floors, and wall thickening. The document also discusses challenges in retrofitting and standards from Indian codes for earthquake-resistant design. The conclusion emphasizes that retrofitting has matured but expertise is still lacking, and optimization is needed to determine the most cost-effective technique for a given structure.
Seismic Retrofitting Techniques & Rehabilitation
Seismic retrofitting is a collection mitigation technique for earthquake engineering.
It is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquake.
It is of utmost important for historic monuments, areas prone to severe earthquakes and tall or
expensive structures.
The retrofitting techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes and severe winds from thunderstorms.
Retrofitting proves to be a better economic consideration and immediate shelter to problems
rather than replacement of building.
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Pt slab design philosophy with slides and pictures showing benefit
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Post Tension
- 1. Post-Tension INDIA Let's Presentation By T RAJKIRAN B SASHI KIRAN S R SAI PRAMOD R BHYRAVA
- 2. Contents: • Introduction • Prestressing • Types of Pre-stressing • Advantages of Post Tensioning • Current situation in India • Applications and Examples of PT constructions • Conclusion
- 3. Introduction • Present issues in India Earthquake prone regions Over-population Soil condition • Present Solutions Seismic isolators Innovation in foundation • Do we have an alternative, effective alternative?
- 4. PRESTRESSING • DEF: To introduce internal stresses to counteract the stresses that will result from applied load. • It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete.
- 5. Types of PRESTRESSING • There are two types of prestressing(tensioning)
- 7. Contd.
- 8. Post Tensioning • Post-tensioning is done at a project site and requires little to no modifications of the same forming system that would be used to construct non pre-stressed concrete. • The systems used to post-tension concrete and masonry consist of prestressing steel that is housed inside a duct or sheath, which allows the prestressing steel to be placed inside the typical job site formwork at the same time rebar and other reinforcing is placed.
- 10. 2.Hydraulic Jack
- 11. 3.Wedges
- 14. Filling of Holes by Grouting
- 15. ADVANTAGES OF PT • Crack control • Economy • Quality • Faster Installation • Controlling deflections • More efficient
- 16. ADVANTAGES OF PT
- 17. ADVANTAGES OF PT
- 18. Usage Of PT • First application have been conceived in 1933 in France. • Currently, 1000000’s of houses are constructed in USA using PT. • How far it is used in India?????
- 19. Current Situation • Usage of ordinary RCC or pre tensioning concrete in India are frequent. • But what about POST TENSIONING? • Can it serve better than ordinary RCC or pre tensioning RCC? Let’s see!!!
- 20. Advantages over ordinary RCC • High seismic resilience • Less consumption of concrete • Stiffer Foundation • Restressable • Time reduction
- 21. Application of PT • Slabs • Residential buildings • Foundations in houses • Multipurpose buildings • Tennis courts
- 22. Post Tensioned Constructions: • San Francisco Public Utilities Commission Headquarters • 2201 Westlake/Enso • Trump International Hotel & Tower
- 23. San Francisco Public Utilities Commission Headquarters
- 25. Trump International Hotel & Tower
- 26. Conclusion What we meant to say through our presentation is that we need to adapt much more innovative and efficient ideas and techniques so that being a Civil Engineer we can serve much better to our nation.