Structural Engineering and Mechanics

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Experimental and numerical study of a proposed steel brace with a localized fuse

  • Parsa, Elham (Department of Civil Engineering, College of Engineering, West Tehran Branch, Islamic Azad University) ;
  • Ghazi, Mohammad (Department of Civil Engineering, College of Engineering, West Tehran Branch, Islamic Azad University) ;
  • Farahbod, Farhang (Department of Civil Engineering, College of Engineering, West Tehran Branch, Islamic Azad University)
  • Received : 2021.09.18
  • Accepted : 2022.09.18
  • Published : 2022.10.25
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Abstract

In this paper, a particular type of all-steel HSS brace members with a locally reduced cross-sectional area was experimentally and numerically investigated. The brace member was strengthened against local buckling with inner and outer boxes in the reduced area. Four single-span braced frames were tested under cyclic lateral loadings. Specimens included a simple steel frame with a conventional box-shaped brace and three other all-steel reduced section buckling-restrained braces. After conducting the experimental program, numerical models of the proposed brace were developed and verified with experimental results. Then the length of the proposed fuse was increased and its effect on the cyclic behavior of the brace was investigated numerically. Eventually, the brace was detailed with a fuse-to-brace length of 30%, as well as the cross-sectional area of the fuse-to-brace of 30%, and the cyclic behavior of the system was studied numerically. The study showed that the proposed brace is stable up to a 2% drift ratio, and the plastic cumulative deformation requirement of AISC (2016) is easily achieved. The proposed brace has sufficient ductility and stability and is lighter, as well as easier to be fabricated, compared to the conventional mortar-filled BRB and all-steel BRB.

Keywords

Acknowledgement

This study is part of a Ph.D. research of the first author under the supervision of the second and third authors. The braced frame tests were carried out at the strong floor laboratory of the structural engineering department of the Road, Housing, and Urban Development Research Center of Iran. The authors wish to express their thanks to the engineering operators of the laboratory, for facilitating all the means in carrying out the experiments.

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