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为了开展地下结构地震时安全性评估,有必要准确了解场地土体的非线性地震响应特点和规律。基于经典的SHAKE程序,建立4种地基土体的计算模型,探讨实际分层土体、等效匀质单层土体、线性与非线性地震响应以及不同地震荷载等因素对自由场地土体地震响应的影响。分析表明:土体的线性和非线性地震响应的差别显著,而且分层土与等效匀质单层土的动力特性有较大差别,实际计算分析时不可简单地将实际分层土体简化为等效匀质单层土体。
In order to evaluate the safety of underground structures during earthquake, it is necessary to understand accurately the characteristics and laws of nonlinear seismic response of site soil. Based on the classical SHAKE program, the calculation models of four kinds of foundation soil are established, and the effects of actual layered soil, equivalent homogeneous single-layer soil, linear and nonlinear seismic responses and different seismic loads on soil earthquakes in free-field The impact of the response. The analysis shows that the difference between the linear and nonlinear seismic responses of soil is significant, and the dynamic characteristics of layered soils are quite different from those of equivalent homogeneous single-layer soils. In actual calculation and analysis, the actual layered soils can not be simplified Equivalent homogeneous single-layer soil.