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

Seung Ho Choi, Inwook Heo, Jae Hyun Kim, Hoseong Jeong, Jae Yeon Lee, Kang Su Kim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

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.

Original languageEnglish
Pages (from-to)75-84
Number of pages10
JournalComputers and Concrete
Volume30
Issue number1
DOIs
StatePublished - Jul 2022

Keywords

  • flexural behavior
  • negative moment
  • post-tensioned method
  • prestressed concrete
  • tendon stress

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