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Experimental evaluation of post-tensioned bridge bent under cyclic loads and comparison to hybrid bridge bents
•Post-tensioned bent with a buckling restrained brace had a hysteretic energy 5.5 times that of the post tensioned-only bent.•Post-tensioned bent with stretch length anchors had a hysteretic energy 3.1 times that of the post tensioned-only bent.•Post tensioned-only bent had a residual drift ratio of...
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Published in: | Engineering structures 2022-04, Vol.256, p.113962, Article 113962 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •Post-tensioned bent with a buckling restrained brace had a hysteretic energy 5.5 times that of the post tensioned-only bent.•Post-tensioned bent with stretch length anchors had a hysteretic energy 3.1 times that of the post tensioned-only bent.•Post tensioned-only bent had a residual drift ratio of 0.9%.•The residual drift ratio of 1.1% for bent with stretch length anchros and 2.3% for bent with buckling restrained brace .
Experimental results for a re-centering bridge bent whose concrete columns were post-tensioned with unbonded high-strength steel bars are presented. The initial post-tensioning forces to achieve column re-centering were obtained using rigid body analogy. Steel collars were provided at the top and bottom ends of the columns for confinement. The column-to-footing interface contained a polyurethane layer inside the shear key to reduce column damage. For the initial post-tensioning forces implemented in the experiment, concrete damage was observed at the bottom of the columns. The post-tensioned (PT) bars remained elastic up to the design drift ratio of 2.0% and yielded at a 5.0% drift ratio; the column longitudinal mild steel bars yielded at a drift ratio of 6.0%. The performance of the post-tensioned bridge bent without any external energy dissipators (PT-Only bent) was compared with that of two similar hybrid bridge bents reinforced with external energy dissipators: the first incorporating tension-only stretch length anchors, and the second incorporating a buckling restrained brace. The two hybrid bents displayed excellent performance compared to the PT-Only bent in terms of strength, stiffness, and hysteretic energy dissipation; however, the PT-Only bent had a superior re-centering efficiency compared to the two hybrid bents. |
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ISSN: | 0141-0296 1873-7323 |
DOI: | 10.1016/j.engstruct.2022.113962 |