Spatial Coherency Model Considering Focal Mechanism Based on Simulated Ground Motions

Keyu Wan, Xiaodan Sun, Yu Liu, Kang Ren, Xiaoying Sun and Yanqing Luo
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Keyu Wan: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Xiaodan Sun: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Yu Liu: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Kang Ren: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Xiaoying Sun: China Nuclear Power Engineering Co., Ltd., Beijing 100840, China
Yanqing Luo: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Sustainability, 2022, vol. 14, issue 4, 1-15

Abstract: The spatial coherencies of ground motions are the key to establishing multi-support excitation for large-dimension structures. Most of the existing models were established based on ground motions recorded at dense observation arrays which barely show any detailed information on the focal mechanism. However, in the near field, ground motions are dominated by the source, and so are the spatial coherencies of ground motions. In this paper, a deterministic physics-based method was used to simulate ground motions in the near field for various focal mechanism scenarios. The coherencies of the simulated ground motions were calculated. The Loh coherency model was used to fit the variation in the calculated coherencies for each scenario. The results show that the focal mechanism has a significant effect on the spatial coherencies of simulated ground motions. Finally, the probability density distributions of the parameters, a and b , of the Loh coherency model were obtained, and a coherency model was proposed, based on the Loh coherency model, in which the parameters are taken to be dependent on the focal mechanism.

Keywords: spatial variation in ground motions; ground motion simulation; focal mechanism; coherency function model; deterministic physics-based method (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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