土-桩-结构相互作用体系非平稳随机地震反应分析

Non-Stationary Random Seismic Response Analysis of Soil-Pile-Structure Interaction Systems

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 of soil-pile-structure dynamic interaction problem has basically and restrainedly been made the response analysis identified or stationary random incentive. Based on one bedrock acceleration response spectrum, the bedrock non-stationary random seismic power spectral density function was gotten using the method of reference [ 7 ]. Using finite element method to build three-dimensional analysis modal of soil-pile-structure interaction system, the response analysis of soil-pile-structure interaction system under the non-stationary random seismic incentive was soil-pile-structure interaction system at three different performed. First, the dynamic characteristic analysis of sites condition was carried out; then, the comparison between bearing platform response of pile foundation and the response of free-field was made. Finally, the response results of displacement power spectral density of the structure were proposed.