Simulation of the spatially correlated multi-point ground motions of the coupled alluvial valley-hill terrain considering the soil nonlinearity

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 118-128.

HE Ying1,2，YIN Benchi1,2，LIU Zhongxian1,2，DING Xiaofan1,2

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Abstract

A spatially correlated multi-point ground motion simulation method considering the nonlinear scattering effect of seismic waves in local site is adopted. The ground motion simulation of mountain-valley coupling site is quantitatively compared and analyzed. Based on the coupled finite element-indirect boundary element method (FEM-IBEM) and the equivalent linear soil model, the nonlinear scattering effect of seismic waves is calculated. The results show that: The presence of mountains will increase the ground motion response in sediments, and the amplification effect on short period seismic waves is more significant, with an increase of up to 50%. Compared to the outside of a single sedimentary valley terrain, the seismic response on the mountain with basin-mountain coupled terrain is reduced. When considering the nonlinearity of the soil, the ground motion intensity of the sedimentary valley is lower than that of the linear model. The peak position of the response spectrum will also change. However, the impact of mountains is more significant. Different mountains have different influences on the valley, the difference in impact on some points within the valley can reach 40%. The research provides some theoretical basis and calculation methods for the seismic fortification of engineering structures in mountain-valley coupled sites.

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HE Ying1, 2, YIN Benchi1, 2, LIU Zhongxian1, 2, DING Xiaofan1, 2. Simulation of the spatially correlated multi-point ground motions of the coupled alluvial valley-hill terrain considering the soil nonlinearity[J]. Journal of Vibration and Shock, 2024, 43(16): 118-128

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