Modeling of spatially correlated, site-reflected, and nonstationary ground motions compatible with response spectrum

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• 作者：De-Yi Zhang ; Wei Liu ; Wei-Chau Xie ; Mahesh D. P ; ey
• 关键词：Ground motion simulation ; Spatially correlated ground motions ; Design response spectrum ; Local site effect ; Nonstationary ground motion
• 刊名：Soil Dynamics and Earthquake Engineering
• 出版年：December, 2013
• 年：2013
• 卷：55
• 期：Complete
• 页码：21-32
• 全文大小：1626 K

文摘

Seismic risk analysis and mitigation of spatially extended structures require the synthesis of spatially varying ground motions in the response history analysis of these structures. These synthetic motions are usually desired to be spatially correlated, site reflected, nonstationary, and compatible with target design response spectra. In this paper, a method is presented for simulating spatially varying ground motions considering the nonstationarity, local site effects, and compatibility of response spectra. The scheme for generating spatially varying and response spectra compatible ground motions is first established for spatial locations on the ground surface with varying site conditions. The design response spectrum is introduced as the 鈥減ower鈥?spectrum at the base rock. The site amplification approach is then derived based on the deterministic wave propagation theory, by assuming that the base rock motions consist of out-of-plane SH wave or in-plane combined P and SV waves propagating into the site with assumed incident angles, from which tri-directional spatial ground motions can be generated. The phase difference spectrum is employed to model ground motions exhibiting nonstationarity in both frequency and time domains with different site conditions. The proposed scheme is demonstrated with numerical examples.