- published: 11 Oct 2010
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Prestressed concrete is the method for overcoming concrete's natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete. It is often used in commercial and residential construction as a foundation slab. Prestressing tendons (generally of high tensile strength steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load. Traditional reinforced concrete is based on the use of steel reinforcement bars, rebars, inside poured concrete. Prestressing can be accomplished in three ways: pre-tensioned concrete, and bonded or unbonded post-tensioned concrete.
Pre-tensioned concrete is cast around steel tendons—cables or bars—while they are under tension. The concrete bonds to the tendons as it cures, and when the tension is released it is transferred to the concrete as compression by static friction. Tension subsequently imposed on the concrete is transferred directly to the tendons.
An illustration of prestressed concrete production by Milbury Systems an Eleco Company. Prestressed concrete is a method of overcoming concrete's natural weaknesses. It can be used to produced longer spans than is practical with standard reinforced concrete. Milbury Systems manufactures a number of precast and prestressed products.
How does a pre-stressed concrete bridge beam work? The strands inside the beam would be compressed applying a significant amount of force by pulling them back, the concrete is casted around the strand, then releasing the strands applying compressing force into the beam. Watch a video tutorial by Steve Lowe, Chief Design Engineer at Shay Murtagh Precast. Bridge Beams, Culverts, Retaining Walls, Parapets and Copings are only some of the products we manufacture for the Road/Highway Sector. With a proven track record in design, production along with our in house logistics and transport crews we have become a leading supplier to major infrastructure projects in the UK and Ireland. A short film describing Shay Murtagh's history, its present and its vision, Shay Murtagh Precast started as an Ir...
Prestressed concrete is a method for overcoming concrete's natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete. Prestressing tendons (generally of high tensile steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load. Traditional reinforced concrete is based on the use of steel reinforcement bars, rebars, inside poured concrete. Please share and subscribe my Chanel.Thank you. Link: https://youtu.be/71AfIbZK1PU
This lecture is a part of CS3001 Concrete Engineering subject for the third year Civil Engineering students at James Cook University, Townsville Australia. Though the design examples mentioned in this lecture are based on Australian Standards AS3600-2009, the fundamental design concepts will be applicable anywhere.
World-leading concrete expert Professor Chris Burgoyne introduces viewers to pre-stressed concrete. This is the third in the Bare Essentials of Concrete series: the key things people who are studying construction or who are working in construction need to understand about concrete. Professor Burgoyne is head of the Structures Lab at the University of Cambridge. In this video he describes the principles behind pre-stressed concrete, its properties and applications and how engineers use the principle in structures. Learning outcomes The effect of applying compressive force to connected elements. How a compressive force eliminates tension in a beam. The advantages compared with reinforced concrete. About the Bare Essentials of Concrete Series This video is part of the Bare Essentials of ...
3D Animation for prestressing concrete beam
Prestressed concrete is a method for overcoming concrete's natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete. Prestressing tendons (generally of high tensile steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load. Traditional reinforced concrete is based on the use of steel reinforcement bars, rebars, inside poured concrete. Video by Elecosoft plc: http://www.eleco.com/
This lecture is a part of CS3001 Concrete Engineering subject for the third year Civil Engineering students at James Cook University, Townsville Australia. Though the design examples mentioned in this lecture are based on Australian Standards AS3600-2009, the fundamental design concepts will be applicable anywhere.
Paul supply all installation components, machines and accessories for prestressing on casting beds. They include the permanent components, such as abutment anchor posts, transverse anchor plates etc. Also when choosing mobile stressing equipment, our large product range always provides the appropriate solution: - Single-wire stressing jacks from 30 to 300 kN prestressing force - Screw jacks - Twin ram jacks - Pump units for stressing jacks, steel cutters, ... - Detensioning pump units - Detensioning cylinders from 200 to 10000 kN - Wire/strand pushing machines - Special detensioning anchors
Introduction to Prestressed Concrete
Introduction to Equivalent Loads
Marty McIntyre of PCI speaks to Eastern Illinois students about the PreCast Concrete Industry and the work process involved.
Dr. Wafeek Wahby, a Professor in the School of Technology at Eastern Illinois University, takes his class on a field trip to County Materials Corporation in Champaign, Illinois and Lombard Architectural Precast Products in Alsip, Illinois. The field trip was co-sponsored by Marty McIntyre, Executive Director of PCI of Illinois.
This lecture is a part of CS3001 Concrete Engineering subject for the third year Civil Engineering students at James Cook University, Townsville Australia. Though the design examples mentioned in this lecture are based on Australian Standards AS3600-2009, the fundamental design concepts will be applicable anywhere.
Analyzing infill prestressed concrete bridges requires consideration of many factors such as staged sequencing analysis, time-dependent materials and tendon loss to just name a few. Furthermore, it is hard to find a FEM program that contains an intuitive modeling tool relative to various construction methods. Through this session, steps on how midas Civil is able to assist the engineer in efficiently modeling an infill prestressed concrete bridges with staged construction information. In addition to this the automated moving load feature will be used to carry the moving load analysis.
Marty McIntyre of PCI speaks to Eastern Illinois students about the PreCast Concrete Industry and the work process involved.