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| Method and program for simulating multi-support underground seismic motions in media-transition circular-arc site with partly filled water |
| Received:March 24, 2022 Revised:July 10, 2022 |
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| DOI：10.7511/jslx20220324001 |
| KeyWord:Media-transition site underground coherency function underground PSD matrix multi-support underground seismic motions |
| Author | Institution |
| 李鑫洋 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;天津大学 建筑工程学院, 天津 |
| 柳国环 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;天津大学 建筑工程学院, 天津 |
| 费琦翔 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;天津大学 建筑工程学院, 天津 |
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| Abstract: |
| A model was established by simultaneously considering the influencing factors of media transition and circular-arc terrain with partly filled water.The corresponding theoretical scheme for the simulation of multi-support underground seismic motions of the target site was presented and a program based on the above methodology was developed with its reliability verified.Firstly, the seismic scattering wavefields special for the site subjected to SV waves are illustrated in detail and the solution of ground response in frequency domain is obtained.Then, the transfer functions based on the solution are calculated and the underground auto-PSD can be expressed subsequently;the underground cross-PSD is given by the underground coherency model and the underground auto-PSD.Thus, the underground PSD matrix is assembled by combining the auto-PSD and cross-PSD.Finally, the multi-support underground accelerations in time domain are achieved by decomposing the underground PSD matrix.The GUI for the generation of multi-support underground seismic motions is further compiled.Numerical examples are conducted to highlight the significance of this study and the results show:(1) There exists a significant difference between the underground and ground seismic motions in frequency domain, which illustrates the necessity for the study.(2) The compatibility of simulating PSD and coherency function with corresponding target values is well expected, which demonstrates the rationality of the results.(3) GUI with flexible and adjustable parameter input is concise and the post-processing results are clear, which reflects the convenience and applicability of the program. |
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