空間回路網法による地震応答解析

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Recently, computer simulation of ground vibration has become fesible as the development of highspeed digital computers with large memory capacity. However, the seismic response analysis of large three-dimensional models is still impractical in time domain because very large CPU time and memory usage are required. Spatial Network Method which is originally developed for the analysis of electromagnetic fields, can also be applied to sound field or elastic wave propagation analysis. This method requires less CPU time, as it is suitable for vector processing. The purpose of this paper is to show the applicability of the Spatial Network Method to analyze seismic response problems. With this method, a three-dimensional elastic medium is modeled as an equivalent electrical circuit. The electric current and the voltage of the equivalent circuit are assumed to correspond to the velocity and the stress in the elastic medium. The current and the voltage are expressed in time domain in the same way as Bergeron's method, which is essentially valid to the one-dimensional wave propagation analysis in time domain. The analysis of the seismic response of an inhomogeneous ground is presented. The calculated results by the Spatial Network Method are compared with those by the Finite Element Method and also with the data experimentally obtained. Good agreement is obtained with other results, and the validity and effectiveness of Spatial Netweork Method is proved.
1992-03-15

空間回路網法による地震応答解析

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