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Response of Soil-Foundation-Structure Systems to Multidirectional Seismic Motion: A Micromechanical Approach

机译:地基-结构系统对多向地震运动的响应:一种微机械方法

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In this study, a three-dimensional microscale framework utilizing the discrete element method (DEM) is presented to analyze the seismic response of soil-foundation-structure systems subjected to three-directional base motion. The granular soil deposit is idealized as a collection of spherical particles using DEM. The foundation is modeled as a rigid block composed of clumped particles and its motion is described by the resultant forces and moments acting upon it. The structure is modeled as a column made of particles that are clumped to idealize a rigid structure. Analysis is done in a fully coupled scheme in time domain. Simulations were conducted to investigate the response of the deposit with and without the structure to various scenarios of multidirectional shaking patterns. Vertical motion amplification in the free-field was similar to that of shear wave propagation. However, there was less nonlinearity for vertical motion compared to horizontal motion. Lateral motion had small impact on the amplification of vertical input motion. The inclusion of vertical motion did not influence the amplification of horizontal motion at frequencies far from the resonance frequency of vertical motion.
机译:在这项研究中,提出了一种利用离散元方法(DEM)的三维微尺度框架,以分析受三向基础运动的土壤基础结构系统的地震响应。使用DEM将粒状土壤沉积物理想化为球形颗粒的集合。基础建模为由块状颗粒组成的刚性块,其运动由作用在其上的合力和力矩来描述。该结构被建模为由粒子组成的圆柱体,这些粒子被聚集以理想化刚性结构。在时域中以完全耦合的方案进行分析。进行模拟以研究具有和不具有结构的沉积物对多向摇动模式的各种情况的响应。自由场中的垂直运动放大与剪切波传播相似。但是,与水平运动相比,垂直运动的非线性较小。横向运动对垂直输入运动的放大影响很小。垂直运动的包含不影响水平运动在远离垂直运动的共振频率的频率处的放大。

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