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Prestress Losses in Post-Tensioned Concrete Masonry Sound Walls
Prestressed masonry has become more popular in the U.S. in recent years. In particular, post-tensioned concrete masonry is likely to be the form of prestressed masonry that is the most cost-effective alternative to conventionally reinforced masonry and other forms of wall construction. Post-tensioned masonry involves the construction of hollow-unit concrete masonry walls with little or no reinforcing and grout. Prestressing tendons are placed vertically in the unit cells during construction as would reinforcing bars in conventional systems. The tendons can be prestressing wire, strand or bar, but bar is likely the most convenient and competitive form currently available in the U.S. The tendons are anchored at the bottom and top of the wall section with steel-hardware anchored against a grouted bond beam or special concrete unit designed to evenly distribute the force from the tendon to the wall. The tendons can then be tensioned with a hydraulic jack or impact wrench. Prestress is checked by hydraulic pressure or DTI (direct-tension indicating) washers and verified by measuring elongation.
Prestress Losses in Post-Tensioned Concrete Masonry Sound Walls
Prestressed masonry has become more popular in the U.S. in recent years. In particular, post-tensioned concrete masonry is likely to be the form of prestressed masonry that is the most cost-effective alternative to conventionally reinforced masonry and other forms of wall construction. Post-tensioned masonry involves the construction of hollow-unit concrete masonry walls with little or no reinforcing and grout. Prestressing tendons are placed vertically in the unit cells during construction as would reinforcing bars in conventional systems. The tendons can be prestressing wire, strand or bar, but bar is likely the most convenient and competitive form currently available in the U.S. The tendons are anchored at the bottom and top of the wall section with steel-hardware anchored against a grouted bond beam or special concrete unit designed to evenly distribute the force from the tendon to the wall. The tendons can then be tensioned with a hydraulic jack or impact wrench. Prestress is checked by hydraulic pressure or DTI (direct-tension indicating) washers and verified by measuring elongation.
Prestress Losses in Post-Tensioned Concrete Masonry Sound Walls
Hamilton, III, H. R. (author) / Woodham, D. B. (author)
Structures Congress 2001 ; 2001 ; Washington, D.C., United States
Structures 2001 ; 1-2
2001-05-18
Conference paper
Electronic Resource
English
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