Steel and Composite Structures

  • 제34권4호
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  • Pages.561-580
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  • 2020
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Prequalification of a set of buckling restrained braces: Part II - numerical simulations

  • Zub, Ciprian Ionut (Department of Steel Structures and Structural Mechanics, Politehnica University of Timisoara) ;
  • Stratan, Aurel (Department of Steel Structures and Structural Mechanics, Politehnica University of Timisoara) ;
  • Dubina, Dan (Department of Steel Structures and Structural Mechanics, Politehnica University of Timisoara)
  • 투고 : 2019.09.18
  • 심사 : 2020.01.15
  • 발행 : 2020.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

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. In the second part of this paper, a complex nonlinear numerical model for the tested BRBs was developed in the finite element environment Abaqus. The calibration of the numerical model was performed at both component (material models: steel, concrete, unbonding material) and member levels (loading, geometrical imperfections). Geometrically and materially nonlinear analyses including imperfections were performed on buckling restrained braces models under cyclic loading. The calibrated models were further used to perform a parametric study aiming at assessing the influence of the strength of the buckling restraining mechanism, concrete class of the infill material, mechanical properties of steel used for the core, self-weight loading, and frame effect on the cyclic response of buckling restrained braces.

키워드

과제정보

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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