Computers and Concrete

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Flexural behavior of post-tensioned precast concrete girder at negative moment region

  • Choi, Seung-Ho (Department of Architectural Engineering, University of Seoul) ;
  • Heo, Inwook (Department of Architectural Engineering, University of Seoul) ;
  • Kim, Jae Hyun (Department of Architectural Engineering, University of Seoul) ;
  • Jeong, Hoseong (Department of Architectural Engineering and Smart City Interdisciplinary Major Program, University of Seoul) ;
  • Lee, Jae-Yeon (Division of Architecture, Mokwon University) ;
  • Kim, Kang Su (Department of Architectural Engineering and Smart City Interdisciplinary Major Program, University of Seoul)
  • Received : 2022.02.06
  • Accepted : 2022.06.30
  • Published : 2022.07.25
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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.

Keywords

Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2021R1I1A3049928).

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