Steel and Composite Structures

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Prequalification of a set of buckling restrained braces: Part I - experimental tests

  • Stratan, Aurel (Department of Steel Structures and Structural Mechanics, Politehnica University of Timisoara) ;
  • Zub, Ciprian Ionut (Department of Steel Structures and Structural Mechanics, Politehnica University of Timisoara) ;
  • Dubina, Dan (Department of Steel Structures and Structural Mechanics, Politehnica University of Timisoara)
  • Received : 2019.09.18
  • Accepted : 2020.01.18
  • Published : 2020.02.25
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Abstract

Buckling restrained braces (BRBs) were developed as an enhanced alternative to conventional braces by restraining their global buckling, thus allowing development of a stable quasi-symmetric hysteretic response. A wider adoption of buckling restrained braced frames is precluded due to proprietary character of most BRBs and the code requirement for experimental qualification. To overcome these problems, BRBs with capacities corresponding to typical steel multi-storey buildings in Romania were developed and experimentally tested in view of prequalification. The first part of this paper presents the results of the experimental program which included sub-assemblage tests on ten full-scale BRBs and uniaxial tests on components materials (steel and concrete). Two different solutions of the core were investigated: milled from a plate and fabricated from a square steel profile. The strength of the buckling restraining mechanism was also investigated. The influence of gravity loading on the unsymmetrical deformations in the two plastic segments of the core was assessed, and the response of the bolted connections was evaluated. The cyclic response of BRBs was evaluated with respect to a set of performance parameters, and recommendations for design were given.

Keywords

Acknowledgement

The research leading to these results has received funding from the MEN-UEFISCDI grant Partnerships in priority areas PN II, contract no. 99/2014 IMSER: "Implementation into Romanian seismic resistant design practice of buckling restrained braces". This support is gratefully acknowledged.

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