Cyclic stress-strain model for steel rebars in FRP-confined concrete considering buckling effect

Y. L. Bai, J. G. Dai

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Buckling of steel reinforcement usually causes a sudden loss of the load-carrying capacity and leads to the ultimate state of conventional reinforced concrete (RC) columns. However, it behaves differently in fiber-reinforced polymer (FRP)-confined RC columns due to the lateral confinement effect of FRP. This paper presents a theoretical study into the buckling behavior of longitudinal steel reinforcing bars embedded in FRP-confined concrete subjected to cyclic axial compression. An empirical monotonic compressive stress-strain model for laterally supported reinforcing bars considering the buckling effect, which was proposed in the authors’ previous study, was extended to a cyclic stress-strain model following the Menegotto-Pinto model accounting for the cyclic loops. The cyclic stress-strain models for laterally supported reinforcing bars as well as FRP-confined plain concrete were then implemented into the OpenSees platform to simulate the cyclic compressive behaviour FRP-confined RC columns and validated through comparisons with test results. The proposed cyclic stress-strain model for laterally supported reinforcing bars can serve as a fundamental law for the modelling of seismic behaviour of FRP-strengthened RC columns, especially for those with sparely- spaced transverse ties where buckling of reinforcing bars becomes a significant concern.

Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
EditorsJ.G. Dai, J.G. Teng
PublisherDepartment of Civil and Environmental Engineering and Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University
Pages990-993
Number of pages4
ISBN (Electronic)9789881448026
Publication statusPublished - 1 Jan 2016
Event8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 - Hong Kong, China
Duration: 14 Dec 201616 Dec 2016

Publication series

NameProceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016

Conference

Conference8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
CountryChina
CityHong Kong
Period14/12/1616/12/16

Keywords

  • Bar buckling
  • Cyclic model
  • FRP confinement
  • OpenSees
  • Stress-strain model

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Polymers and Plastics

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