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Steel and Composite Structures Volume 31, Number 2, April25 2019 , pages 149-158 DOI: https://doi.org/10.12989/scs.2019.31.2.149 |
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Mechanics of a variable damping self-centering brace: Seismic performance and failure modes |
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Xing-Si Xie, Long-He Xu and Zhong-Xian Li
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| Abstract | ||
| The force-deformation behavior, strain distribution and failure modes of a variable damping self-centering brace (VD.SCB) are theoretically analyzed, experimentally studied, and numerically simulated to guide its design. The working principle of the brace is explained by describing the working stages and the key feature points of the hysteretic curve. A large-scale brace specimen was tested under different sinusoidal excitations to analyze the recentering capability and energy dissipation. Results demonstrate that the VD.SCB exhibits a full quasi-flag-shaped hysteretic response, high ultimate bearing capacity, low activation force and residual deformation, and excellent recentering and energy dissipation capabilities. Calculation equations of the strain distribution in different parts of the brace are proposed and are compared with the experimental data and simulated results. The developments of two failure modes are compared. Under normal circumstances, the brace fails due to the yielding of the spring blocking plates, which are easily replaced to restore the normal operating conditions of the brace. A brief description of the design procedure of the brace is proposed for application. | ||
| Key Words | ||
| self-centering brace; variable damping; hysteretic response; strain distribution; failure mode | ||
| Address | ||
| (1) Xing-Si Xie, Long-He Xu: School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; (2) Zhong-Xian Li: Key Laboratory of Coast Civil Structure Safety of China Ministry of Education, Tianjin University, Tianjin 300072, China. | ||