考虑场地各向异性的结构输入地震反应谱调整

Research on the Response Spectrum Adjustment of Earthquake Input for Anisotropy Site

为了预测地震动特性,同时考虑场地土动力特性各向异性及其对结构输入地震动的影响,基于地震各向异性理论,提出了场地动力特性各向异性的概念,研究了场地动力特性各向异性的微动测试分析方法.考虑地震动的各向异性特征,分析了地震动各向异性对结构地震动力响应的影响,以及结构分析中现有的地震时程选择和调整中存在的问题,提出了基于场地微动测试确定场地动力特性及其各向异性的输入地震动调整新思想.

Considering the anisotropic characteristic of soil and the influence of earthquake input under anisotropy dynamic properties of the soil, the conception Of the ground dynamic properties has been put forward to predict the characteristics of ground seismic. The method for determining the dynamic properties of the soil by use of ground microtremor, based on the theory of elastic wave, has been studied in this article. Considering also the anisotropic characteristic of ground motion, this paper analyses the influence of the architecture response under anisotropic ground seismic and discusses some problems of the existing methods to the choice and the adjustment of determining seismic ground motion time history for analysis of structures. A method of determining ground motion time history on the basis of site condition that is determined by use of ground microtremor can also be used for predicting the anisotropy characteristics of ground seismic.