Regional seismic damage analysis considering soil–structure cluster interaction using lumped parameter models: a case study of Sichuan University Wangjiang Campus buildings
Regional seismic damage analysis considering soil–structure cluster interaction using lumped parameter models: a case study of Sichuan University Wangjiang Campus buildings
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DOI：
10.1007/s10518-021-01149-2
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发表时间：
2021-06
影响因子：
4.6
通讯作者：
Bowen Zhang;F. Xiong;Yang Lu;Qi Ge;Yang Liu;Z. Mei;Ming‐Ming Ran
中科院分区：
文献类型：
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作者：
Bowen Zhang;F. Xiong;Yang Lu;Qi Ge;Yang Liu;Z. Mei;Ming‐Ming Ran
基于时程分析的建筑集群区域震害分析，可以获得震害演化与分布，为结构性能评价、地震损失估算和震后应急决策提供支持。土-结构团簇相互作用（SSCI）效应由于邻近建筑物通过下垫土的影响而显著影响建筑物的地震破坏。然而，目前区域震害模拟中，由于采用有限元对大尺度土域进行离散化，SSCI效应要么被忽略，要么计算成本极高。为此，本研究提出了集总参数模型（lpm）作为SSCI系统区域地震损伤模拟的一种简单有效的工具，它对参数分析特别有用，也可以实现快速的区域损伤评估。lpm将基于层的多自由度建筑与“基础弹簧”结合起来，用于表示土壤-基础相互作用和基础-土壤-基础相互作用。以四川大学望江校区320栋建筑为例，进行了震害分析。具体案例研究结果表明，在大多数情况下，SSCI效应对建筑物的破坏较小，特别是在软土上。然而，在某些情况下，例如在坚硬的土壤上，SSCI效应可能导致建筑物更高的结构破坏。结果还表明，采用包含地基晃动的名义层间位移比作为损伤指标可能会低估高层建筑较低层的层间地震损伤。
Regional seismic damage analysis of building clusters based on time history analysis enables damage evolution and distribution to be obtained for structural performance evaluation, seismic loss estimation, and post-earthquake emergency response decision support. Soil–structure cluster interaction (SSCI) effects have been shown to affect significantly seismic damage to buildings due to the influence of neighboring buildings through underlying soils. However, SSCI effects in current regional seismic damage simulations are either ignored or obtained with exceptionally high computation cost due to the common discretization of large scale soil domains using finite elements. To this end, lumped parameter models (LPMs) are presented in this work as a simple effective tool for regional seismic damage simulation of SSCI systems, which is particularly useful for parametric analysis and also enables fast regional damage assessments. The LPMs combine story-based multiple-degree-of-freedom buildings with ‘foundation springs’ that are used to represent soil–foundation interaction and foundation–soil–foundation interaction. Seismic damage analysis of 320 buildings on Wangjiang campus of Sichuan University in China is used as a case study. The results of the specific case study show, that in most cases, SSCI effects result in lower damage to buildings, especially on soft soils. However, the SSCI effects may lead to higher structural damage to buildings in some cases, e.g. those on stiff soils. The results also show that using nominal inter-story drift ratio which includes foundation rocking rotation as the damage index may underestimate story seismic damage to lower stories of tall buildings.