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目前,有关土-结构动力相互作用问题的研究基本上多限于确定性的或平稳随机激励下的响应分析。文中基于某基岩加速度反应谱,利用文献[7]的方法求取基岩非平稳随机地震功率谱密度函数,采用有限元方法建立土-桩-结构相互作用体系的三维分析模型,对在非平稳随机地震激励下土-桩-结构相互作用体系进行了反应分析。首先对三种不同场地条件下的土-桩-结构相互作用体系进行了动力特性分析;然后,对在非平稳随机地震激励下桩基承台的反应和自由场反应进行了比较,给出了结构的位移功率谱响应结果。
At present, the research on the soil-structure dynamic interaction is mostly limited to response analysis under deterministic or stationary random excitation. Based on the acceleration response spectrum of a bedrock, the power spectrum density function of the non-stationary random seismic bedrock is obtained by the method of [7], and the three-dimensional analytical model of soil-pile-structure interaction system is established by finite element method. Soil-pile-structure interaction system under steady random earthquake excitation is analyzed. Firstly, the dynamic characteristics of soil-pile-structure interaction system under three different site conditions are analyzed. Then, the response of free-standing pile foundation and the free-field reaction under non-stationary random earthquake excitation are compared. Structure displacement power spectrum response results.