Structural Engineering and Mechanics

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Feasibility study of buckling-restrained braces with PM-35 steel core

  • Zhao, Chao (Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control & School of Civil Engineering, Hunan University of Science and Technology) ;
  • Chen, Qianqian (Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control & School of Civil Engineering, Hunan University of Science and Technology) ;
  • Zhong, Xingu (Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control & School of Civil Engineering, Hunan University of Science and Technology) ;
  • Zhang, Tianyu (Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control & School of Civil Engineering, Hunan University of Science and Technology) ;
  • Chen, Zhiwen (Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control & School of Civil Engineering, Hunan University of Science and Technology)
  • Received : 2021.02.24
  • Accepted : 2021.05.17
  • Published : 2021.07.25
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Abstract

The energy dissipation characteristics of core materials greatly influence the working performance of buckling-restrained braces (BRBs), so it is a vital work to develop more excellent energy dissipation core materials. In this research, a series of experimental studies are conducted, including the mechanical properties of PM-35 steels and the working performance of PM-35 BRB specimens, which serve to investigate the feasibility of PM-35 steel as core materials of BRBs. In addition, the analysis of variance (ANOVA) has been conducted to study the sensitivity factors of energy dissipation of PM-35 BRB specimens, especially the pre-force applied on the BRB specimens. According to the results of this research, it can be concluded that the energy absorption efficiency of PM-35 BRBs specimens is much higher than that of BRB specimens with ordinary core materials; the internal pores greatly weaken the yield strength of PM-35 steel and obviously improve the plastic deformation capacity, which makes that PM-35 core materials are able to absorb energy in a lower stress level; pre-force applied on core materials is the key factor governing the energy absorption, and can significantly improve the working performance of BRB specimens with PM-35 core materials.

Keywords

Acknowledgement

The research described in this paper is financially supported by the Natural Science Foundation of China (51678235), Natural Science Foundation of Hunan Province (2020JJ5195) and Scientific Research Foundation of Hunan Provincial Education Department (CN) (20B218). The supports are gratefully acknowledged.

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