Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Performance Analysis of Steel-Composite Buckling-Restrained Brace

Document Type : Original Article

Authors
Mohsen Haidari 1
Bahram Navayi Neya 2
morteza hosseinali beygi 3
1 Ph.D Candiate, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Professor,< Faculty of , Civil Engineering< , Babol Noshirvani University of Technology, Babol Iran
3 Assistant Professor, Faculty of Civil Engineering,, Babol Noshirvani University of Technology, Babol, Iran
10.22065/jsce.2024.458818.3421
Abstract
Buckling-restrained braces (BRBs) are vital components in steel-braced frames. These diagonal braces act to dissipate energy and resist lateral earthquake loads. They typically consist of a slender steel core encased in concrete or steel to prevent buckling under compression. Engineered cementitious composites (ECC), also known as ECC concrete, have gained significant interest due to their numerous advantages over conventional concrete. This paper introduces a novel Steel-Composite Buckling-Restrained Brace (SC-BRB) that leverages the combined benefits of ECC and a steel casing. The proposed SC-BRB features a unique diamond-shaped composite core, an internal stiffener for added stability, and an outer buckling-restraining casing. To investigate its seismic performance, an extensive parametric study was conducted using the finite element method (FEM) in ABAQUS software. Different specimens were analyzed based on variations in the distance between the inner and outer casings, the thickness of the outer casing, and the use of normal concrete versus ECC. The results demonstrate that the proposed SC-BRB exhibits stable hysteretic behavior, indicating excellent energy dissipation and good ductility. Furthermore, the combination of the outer casing and ECC core significantly impacts the initial stiffness and ultimate strength. Compared to a conventional BRB, the SC-BRB exhibits an average increase of 20% in initial stiffness, 14% in ultimate tensile capacity, and a remarkable 54% improvement in ultimate compressive capacity. The outer casing also contributes to an 89% increase in ductility and a 31% improvement in equivalent viscous damping. The hysteresis responses revealed that under compressive loading, the SC-BRB initiates buckling, leading to contact between the core and the outer casing. This contact generates a frictional force that significantly enhances the compressive resistance. The near-identical shapes of the tensile and compressive portions of the hysteresis loop confirm the excellent buckling resistance performance of the SC-BRB.
Keywords
Buckling-restrained brace
Steel-composite core
Engineered cementitious composite (ECC)
Hysteretic behavior
Numerical study

Subjects

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  • Receive Date 02 March 1403
  • Revise Date 09 May 1403
  • Accept Date 24 June 1403