考虑土体非线性山-谷耦合复杂场地空间相关多点地震动模拟

何颖1, 2, 尹奔驰1, 2, 刘中宪1, 2, 丁晓凡1, 2

振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 118-128.

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 118-128.
论文

考虑土体非线性山-谷耦合复杂场地空间相关多点地震动模拟

  • 何颖1,2,尹奔驰1,2,刘中宪1,2,丁晓凡1,2
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Simulation of the spatially correlated multi-point ground motions of the coupled alluvial valley-hill terrain considering the soil nonlinearity

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

采用考虑局部场地非线性地震波散射效应的空间相关多点地震动模拟方法,对山-谷耦合场地的地震动进行定量模拟分析。非线性地震波散射效应基于有限元-间接边界元耦合方法(FEM-IBEM)和等效线性土体模型进行计算。结果表明:山体的存在会增大沉积内的地震动反应,对短周期的地震波的放大效应更为显著,增幅可达50%。相较于单一沉积谷地地形的沉积谷地外部,山-谷耦合场地中山体地震响应有所减小。相比线性模型,考虑土体非线性时,沉积谷地地震动强度较线性时的结果有所降低,反应谱峰值位置也会发生改变,但山体影响更为显著。不同山体形状对谷地影响不同,对于谷地内部分点位影响的差别可达40%。研究为山-谷耦合场地工程结构抗震设防提供了部分理论依据和计算方法。

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.

关键词

地震动模拟 / 等效线性化 / 局部场地效应 / 有限元-边界元耦合方法 / 山-谷耦合场地

引用本文

导出引用
何颖1, 2, 尹奔驰1, 2, 刘中宪1, 2, 丁晓凡1, 2. 考虑土体非线性山-谷耦合复杂场地空间相关多点地震动模拟[J]. 振动与冲击, 2024, 43(16): 118-128
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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