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Geomechanics and Engineering Volume 36, Number 3, February10 2024 , pages 303-316 DOI: https://doi.org/10.12989/gae.2024.36.3.303 |
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Collapse failure mechanism of subway station under mainshock-aftershocks in the soft area |
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Zhen-Dong Cui, Wen-Xiang Yan and Su-Yang Wang
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| Abstract | ||
| Seismic records are composed of mainshock and a series of aftershocks which often result in the incremental damage to underground structures and bring great challenges to the rescue of post-disaster and the repair of post-earthquake. In this paper, the repetition method was used to construct the mainshock-aftershocks sequence which was used as the input ground motion for the analysis of dynamic time history. Based on the Daikai station, the two-dimensional finite element model of soil-station was established to explore the failure process of station under different seismic precautionary intensities, and the concept of incremental damage of station was introduced to quantitatively analyze the damage condition of structure under the action of mainshock and two aftershocks. An arc rubber bearing was proposed for the shock absorption. With the arc rubber bearing, the mode of the traditional column end connection was changed from "fixed connection" to "hinged joint", and the ductility of the structure was significantly improved. The results show that the damage condition of the subway station is closely related to the magnitude of the mainshock. When the magnitude of the mainshock is low, the incremental damage to the structure caused by the subsequent aftershocks is little. When the magnitude of the mainshock is high, the subsequent aftershocks will cause serious incremental damage to the structure, and may even lead to the collapse of the station. The arc rubber bearing can reduce the damage to the station. The results can offer a reference for the seismic design of subway stations under the action of mainshock-aftershocks. | ||
| Key Words | ||
| collapse damage; earthquake resistance of underground structure; mainshock-aftershocks sequence; shock absorption; seismic precautionary intensity | ||
| Address | ||
| Zhen-Dong Cui, Wen-Xiang Yan and Su-Yang Wang: State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P.R. China | ||