A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Specifications for Unbonded Post-Tensioning Tendons
The first use of unbonded post-tensioning in the United States was for roof slabs constructed in the late 1950s by the lift slab method where the slabs were cast on forms on the ground and then lifted into place; the tendons consisted of buttonheaded wires wrapped in paper. Since that time, the amount of unbonded post-tensioning used in building construction has increased dramatically and there have been considerable changes in both construction methods and post-tensioning systems. Almost all unbonded post-tensioning is now done with cast-in-place concrete and uses plastic-sheathed, seven-wire strand. Post-tensioning has proved to be a safe, economical, and durable means of concrete construction that allows designs which otherwise would not be possible. However, as with all construction, proper design and proper construction methods must be followed. It is essential that both designers and field personnel understand and follow the requirements in ACI 423.7 and ACI 301, as well as the other relevant industry documents.
Specifications for Unbonded Post-Tensioning Tendons
The first use of unbonded post-tensioning in the United States was for roof slabs constructed in the late 1950s by the lift slab method where the slabs were cast on forms on the ground and then lifted into place; the tendons consisted of buttonheaded wires wrapped in paper. Since that time, the amount of unbonded post-tensioning used in building construction has increased dramatically and there have been considerable changes in both construction methods and post-tensioning systems. Almost all unbonded post-tensioning is now done with cast-in-place concrete and uses plastic-sheathed, seven-wire strand. Post-tensioning has proved to be a safe, economical, and durable means of concrete construction that allows designs which otherwise would not be possible. However, as with all construction, proper design and proper construction methods must be followed. It is essential that both designers and field personnel understand and follow the requirements in ACI 423.7 and ACI 301, as well as the other relevant industry documents.
Specifications for Unbonded Post-Tensioning Tendons
Gail S Kelley (author)
2016
Article (Journal)
English
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Ultimate Stress for Unbonded Post-Tensioning Tendons in Partially Prestressed Beams
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