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Seismic damage evaluation of an entire underground subway system in dense urban areas by 3D FE simulation
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.tust.2020.103351
Wenting Li , Qingjun Chen

Abstract Underground structures often pass beneath high-rise buildings or are located close to them in megacities. Given complex site-city interactions, conventional earthquake engineering practices may leave megacities in seismically prone areas in potential danger. Rather than focusing purely on the interaction between soil and either surface structures or underground structures, this study aims to explore the earthquake-induced hazard of a dense urban area with an entire subway station, two long subway tunnels and 36 fully modeled high-rise piled frame buildings. The study is conducted through the 3D fully coupled dynamic analysis in both the time and frequency domains, emphasizing the influence of aboveground buildings on underground structures. The results reveal that the existence of aboveground buildings generally decreases the station’s response and can either increase or decrease the subway tunnel’s responses. The presence of either aboveground structures or underground structures affects the wavefield and in turn the responses of adjacent structures, highlighting the importance of considering soil-city interactions. The station is most dangerous at the columns’ bottoms. The existence of subway stations and tunnels increases the nearby peak ground accelerations.

中文翻译:

通过 3D FE 模拟对密集城区的整个地下地铁系统进行地震破坏评估

摘要 地下结构通常穿过高层建筑下方或位于大城市附近。鉴于复杂的场地-城市相互作用,传统的地震工程实践可能会使地震多发地区的特大城市处于潜在危险之中。本研究不单纯关注土壤与地表结构或地下结构之间的相互作用,而是旨在探索具有整个地铁站、两条长地铁隧道和 36 个完全建模的高层桩的密集城区的地震诱发危害。框架建筑。该研究通过时域和频域的 3D 全耦合动态分析进行,强调地上建筑物对地下结构的影响。结果表明,地上建筑物的存在通常会降低车站的响应,并且可以增加或减少地铁隧道的响应。地上结构或地下结构的存在会影响波场,进而影响相邻结构的响应,突出了考虑土壤-城市相互作用的重要性。车站在柱子底部最危险。地铁站和隧道的存在增加了附近的峰值地面加速度。车站在柱子底部最危险。地铁站和隧道的存在增加了附近的峰值地面加速度。车站在柱子底部最危险。地铁站和隧道的存在增加了附近的峰值地面加速度。
更新日期:2020-05-01
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