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Computers and Concrete Volume 30, Number 1, July 2022 , pages 75-84 DOI: https://doi.org/10.12989/cac.2022.30.1.075 |
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Flexural behavior of post-tensioned precast concrete girder at negative moment region |
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Seung-Ho Choi, Inwook Heo, Jae Hyun Kim, Hoseong Jeong, Jae-Yeon Lee and Kang Su Kim
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| Abstract | ||
| This study introduced a post-tensioned precast concrete system that was developed and designed to improve the performance of joints by post-tensioning. Full-scaled specimens were tested to investigate flexural performances at the negative moment region, where the test variables were the presence of slabs, tendon types, and post-tensioned lengths. A specimen with slabs exhibited significantly higher stiffness and strength values than a specimen without slabs. Thus, it would be reasonable to consider the effects of a slab on the flexural strength for an economical design. A specimen with unbonded mono-tendons had slightly lower initial stiffness and flexural strength values than a specimen with bonded multi-tendons but showed greater flexural strength than the value specified in the design codes. The post-tensioned length was found to have no significant impact on the flexural behavior of the proposed post-tensioned precast concrete system. In addition, a finite element analysis was conducted on the proposed post-tensioned precast concrete system, and the tests and analysis results were compared in detail. | ||
| Key Words | ||
| flexural behavior; negative moment; post-tensioned method; prestressed concrete; tendon stress | ||
| Address | ||
| Seung-Ho Choi, Inwook Heo, Jae Hyun Kim: Department of Architectural Engineering, University of Seoul, 163 Siripdaero, Dongdaemun-gu, Seoul, 02504, Korea Hoseong Jeong: Department of Architectural Engineering and Smart City Interdisciplinary Major Program, University of Seoul, 163 Siripdaero, Dongdaemun-gu, Seoul, 02504, Korea Jae-Yeon Lee: Division of Architecture, Mokwon University, 88 Doanbuk-ro, Seo-gu, Daejeon, 35349, Korea Kang Su Kim: Department of Architectural Engineering and Smart City Interdisciplinary Major Program, University of Seoul, 163 Siripdaero, Dongdaemun-gu, Seoul, 02504, Korea | ||