Evaluating the performance of a new friction-slip damper and comparing it with the conventional concentrically braces

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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

In the lateral resistance systems of conventional concentrically bracing, braces and gusset plates play the role of a structural fuse; in such a way that the braces experience yielding in the tension and buckling and out-of-plane deformations in the compression. Additionally, due to the formation of plastic hinges in braces and gusset plates, these members experience a decrease in axial strength and stiffness as well as structural damage such as permanent deformations, creases, and distortions. Hence, in structures equipped with a conventional concentrically bracing system, after experiencing moderate or severe earthquakes, there is a need to replace or repair the damaged members. In this study, to prevent buckling and yielding in braces and not to occur structural damages in the members, a new friction-slip damper was introduced. To evaluate and compare the performance of the new friction-slip damper with that of the conventional concentrically bracing system, three cross-sections were considered for braces. In other words, once these three cross-sections were considered in conventional concentrically braces and once again they were utilized in friction-slip dampers. These braces were simulated in finite element software. The friction-slip dampers were designed in such a way that the slip occurs in the friction-slip connections before the brace achieves its critical buckling or yielding capacity. The results showed no yielding, out-of-plane displacement, permanent deformation, distortion, and other structural damage in the dampers. In the proposed system, due to the activation of the frictional connection before the critical buckling or yielding capacity of the braces, out-of-plane buckling and yielding and as a result the degradation of axial strength and stiffness do not occur. Also, using the proposed damper brace in the structural systems instead of the conventional concentrically bracing system, increases the seismic energy dissipation capacity by 139.9% on average.

Language:
Persian
Published:
Journal of Structure & Steel, Volume:18 Issue: 44, 2024
Pages:
36 to 51
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