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The Use of Loop Anchorages in Single-Span Post-Tensioned Concrete Slab Bridges
Loop anchorages were incorporated in the post-tensioning system for three single-span post-tensioned concrete slab bridges that were part of the I-35W St. Anthony Falls Bridge Design-Build Project in Minneapolis, Minnesota. Constraints on the available structure depth and owner-specified modifications to the AASHTO Load and Resistance Factor Design specifications required a very close spacing of the post-tensioning tendons. Several post-tensioning options were considered. A typical post-tensioning system with two accessible anchorages would have produced interference problems in the anchorage zones. The use of non-accessible dead-end anchorages was eliminated due to the great difficulties associated with replacing tendons in case a tendon should fail during the stressing operations. Such problems would have delayed the project schedule and would have adversely affected the life expectancy of the slab. The use of loop anchorages effectively doubled the distance between the stressing anchorages, eliminated the concerns surrounding embedded dead-end anchorages, and helped provide the required levels of the prestressing force.
The Use of Loop Anchorages in Single-Span Post-Tensioned Concrete Slab Bridges
Loop anchorages were incorporated in the post-tensioning system for three single-span post-tensioned concrete slab bridges that were part of the I-35W St. Anthony Falls Bridge Design-Build Project in Minneapolis, Minnesota. Constraints on the available structure depth and owner-specified modifications to the AASHTO Load and Resistance Factor Design specifications required a very close spacing of the post-tensioning tendons. Several post-tensioning options were considered. A typical post-tensioning system with two accessible anchorages would have produced interference problems in the anchorage zones. The use of non-accessible dead-end anchorages was eliminated due to the great difficulties associated with replacing tendons in case a tendon should fail during the stressing operations. Such problems would have delayed the project schedule and would have adversely affected the life expectancy of the slab. The use of loop anchorages effectively doubled the distance between the stressing anchorages, eliminated the concerns surrounding embedded dead-end anchorages, and helped provide the required levels of the prestressing force.
The Use of Loop Anchorages in Single-Span Post-Tensioned Concrete Slab Bridges
Christensen, Matthew J. (author) / Millner, Gottfried (author)
Structures Congress 2010 ; 2010 ; Orlando, Florida, United States
Structures Congress 2010 ; 342-354
2010-05-18
Conference paper
Electronic Resource
English
The Use of Loop Anchorages in Single-Span Post-Tensioned Concrete Slab Bridges
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