A numerical coupling scheme for nonlinear time history analysis of buildings on a regional scale considering site‐city interaction effects |
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| Authors: | Xinzheng Lu Yuan Tian Gang Wang Duruo Huang |
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| Affiliation: | 1. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing, P.R., China;2. Beijing Engineering Research Center of Steel and Concrete Composite Structures, Tsinghua University, Beijing, China 100084;3. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;4. Department of Hydraulic Engineering, Tsinghua University, Beijing, P.R., China 100084 |
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| Abstract: | Seismic damage simulation of buildings on a regional scale is important for loss estimation and disaster mitigation of cities. However, the interaction among densely distributed buildings in a city and the site, ie, the “site‐city interaction (SCI) effects,” is often neglected in most regional simulations. Yet, many studies have found that the SCI effects are very important in regional simulations containing a large number of tall buildings and underground structures. Therefore, this work proposed a numerical coupling scheme for nonlinear time history analysis of buildings on a regional scale considering the SCI effects. In this study, multiple‐degree‐of‐freedom models are used to represent different buildings above the ground, while an open source spectral element program, SPEED, is used for simulating wave propagation in underlying soil layers. The proposed numerical scheme is firstly validated through a shaking table test. Then, a detailed discussion on the SCI effects in a 3D basin is performed. Finally, a nonlinear time history analysis of buildings on a regional scale is performed using the Tsinghua University campus in Beijing as a case study. The Tsinghua University campus case results show that the SCI effects will reduce the seismic responses of most buildings. However, some buildings will suffer much more severe damage when the SCI effects are considered, which may depend on the input motions, site characteristics, and building configurations. |
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| Keywords: | multiple‐degree‐of‐freedom model regional seismic damage simulation site‐city interaction effect SPEED time history analysis |
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