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3D time-domain nonlinear analysis of soil-structure systems subjected to obliquely incident SV waves in layered soil media

机译:三维时域非线性分析在分层土壤介质中倾斜入射的SV波浪的土壤结构系统

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摘要

Numerous experiments and prior analyses have confirmed that the angle of incidence of a seismic wave can significantly affect ground response and dynamic soil-structure interaction (SSI) behavior. Realistically, obliquely incident waves will be generated due to the soil heterogeneity and stratigraphy, which can lead into complex wave propagation and scattering patterns. In this study, we propose a novel methodology that (i) utilizes the wave potential theory to derive the 3D time-domain analytical solutions for free-field response under obliquely incident SV waves in layered soil media; (ii) makes use of high-fidelity numerical tools-namely, the domain reduction method (DRM) and the perfectly matched layers (PMLs)-to inject the obliquely incident waves into the domain of interest and to absorb the outgoing scattered motions, respectively; (iii) enables nonlinear time-domain site response and SSI analyses that feature an advanced constitutive model for soil. Finally, a 3D 20-story steel building is modeled as a case study. The building rests on a two-layer half-space and is subjected to an obliquely incident seismic wave. The SV wave's angles of incidence are varied to investigate its effects on structural responses, such as horizontal, vertical, and rotational floor accelerations, as well as interstory drift ratios.
机译:许多实验和现有分析证实,地震波的发生角度可以显着影响地面响应和动态土结构相互作用(SSI)行为。现实地,由于土壤异质性和地层,将产生倾斜入射波,这可能导致复杂的波传播和散射图案。在这项研究中,我们提出了一种新的方法,(i)利用波势理论在层状土壤介质中倾斜入射的SV波下的自由场响应获得3D时域分析解决方案; (ii)利用高保真数值工具 - 即,域还原方法(DRM)和完美匹配的层(PMLS) - 将倾斜入射波注入感兴趣的领域,并分别吸收输出散射的运动; (iii)启用非线性时域站点响应和SSI分析,该分析具有先进的土壤本构模型。最后,建模3D 20层钢制建筑物作为案例研究。该建筑物搁置在两层半空间上,并经受倾斜的入射地震波。 SV波的入射角变化,以研究其对结构响应的影响,例如水平,垂直和旋转地板加速度,以及惰性漂移比。

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