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Seismic Behavior and Design Approach of Variable-Damping Self-Centering Braced Frame
| 题名： | Seismic Behavior and Design Approach of Variable-Damping Self-Centering Braced Frame |
| 正文语种： | eng |
| 作者： | Xu, Longhe;Xie, Xingsi;Li, Zhongxian |
| 作者单位： | Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;Tianjin Univ Minist Educ Key Lab Coast Civil Struct Safety China Tianjin 300072 Peoples R China |
| 关键词： | Braced frame structure;Self-centering brace;Magnetorheological fluid;Variable damping;Seismic behavior;Seismic resilience |
| 摘要： | In this paper, the seismic performance and resilience of a 15-story variable-damping self-centering braced frame (VD-SCBF) were analyzed. The interstory drift ratios (IDRs) of the VD-SCBF are similar to those of the buckling-restrained braced frame, but are lower than the prepressed self-centering braced frame (PS-SCBF). The residual deformation ratios (RDRs) of the VD-SCBF are reduced, and its story acceleration ratios are smaller than the PS-SCBF. Under near-fault earthquakes, the higher-order mode has a greater impact, which increases the inelastic response and ductility demand. The effects of the brace design parameters on structural performance were also investigated. The optimal design parameters are as follows: the activation displacement is appropriately small; the variable-damping region corresponds to the axial displacement of 1% IDR; the ratio of the prepressed force to initial Coulomb damping force is 1.0-1.1; and the viscous damping coefficient increases. Combining the damage development process of different components, the VD-SCBF can be designed based on its four seismic performance levels to ensure a reliable resilience. (C) 2021 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 147 |
| 期： | 6 |
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