Steel and Composite Structures

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Hysteretic performance of the all-steel buckling-restrained brace with LY315 steel core

  • Wei, Xuan (The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology) ;
  • Yang, Lu (The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology) ;
  • Chen, Yohchia Frank (School of Civil Engineering, Chongqing University) ;
  • Wang, Meng (School of Civil Engineering, Beijing Jiaotong University)
  • Received : 2020.12.23
  • Accepted : 2022.09.16
  • Published : 2022.09.25
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Abstract

To study the seismic performance of the all-steel buckling-restrained brace (BRB) using the novel soft steel LY315 for core member, a total of three identical BRBs were designed and a series of experimental and numerical studies were conducted. First, monotonic and cyclic loading tests were carried out to obtain the mechanical properties of LY315 steel. In addition, the parameters of the Chaboche model were calibrated based on the test results and then verified using ABAQUS. Second, three BRB specimens were tested under cyclic loads to investigate the seismic performance. The failure modes of all the specimens were identified and discussed. The test results indicate that the BRBs exhibit excellent energy dissipation capacity, good ductility, and excellent low-cycle fatigue performance. Then, a finite element (FE) model was established and verified with the test results. Furthermore, a parametric study was performed to further investigate the effects of gap size, restraining ratio, slenderness ratio of the yielding segment, and material properties of the core member on the load capacity and energy dissipation capacity of BRBs.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (Grant No. 51922001), and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51421005).

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