Study on Multi-support and Multi-dimensional Ground Motions in Complicated Terrain Area

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (14) : 195-201.

Tian Li, Gai Xia

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Abstract

The simulation of multi-support and multi-dimensional ground motions in a complicated terrain area is studied. The power spectrum on base rock is obtained from the acceleration response spectra. The wave propagation theory of multi-dimensional ground motions with multiple soil layers and the selection of coherence function on base rock are introduced. Using the power spectrum and the coherence function on base rock, the simulation method of multi-support and multi-dimensional ground motions in the complicated terrain area is carried out. According to the analysis of a calculation case, the time history curves and power spectra of three different points in the complicated terrain area with multiple soil layers are generated. The amplification functions of different components of seismic wave are shown. Through the comparison of the coincidence degree of the power spectra and the coherence function, the accuracy of results is verified. The research results could be applied to the seismic analysis of large span structures in complicated terrain areas.

Key words

multi-support and multi-dimensional ground motions / theory of wave propagation / response spectra on base rock / coherence function on base rock / complicated terrain area

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Tian Li, Gai Xia. Study on Multi-support and Multi-dimensional Ground Motions in Complicated Terrain Area[J]. Journal of Vibration and Shock, 2016, 35(14): 195-201

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