结构与复杂层状地基动力相互作用的研究

The solution of dynamic soil-structure interaction (SSI) is the key issue for the seismic safety evaluation for nuclear structures, dams, bridges, and high-rise buildings. The complex foundation has very important influence on the dynamic characteristics of footings as well as the upper structures, especially if the foundation is heterogeneous and anisotropic. There still exist many unsolved difficulties in such problems. And the influence mechanism to the dynamic interaction between structure and soil awaits further study. Based on the integral transformation to the dynamic wave equations of the complex stratified soil, combined with application of the dual equation and precise integration method, this project presents a further research to the dynamic interaction problem between the structure and soil. The main researches content includes: present a rigorous solution to the dynamic displacement and stress response of the complex stratified soil with free field. Build a high efficiency and high precision numerical model for the solution of the dynamic interaction between structure and complex stratified soil. Study the influence mechanism of the heterogeneous and anisotropic properties of the complex stratified foundation to the SSI on this base. This research has important scientific significance and research value to the structure design and seismic safety evaluation on the complex stratified foundation.

结构-地基动力相互作用求解是核电结构、大坝、桥梁以及高层建筑等抗震安全评价的重要内容。复杂地基对基础以及上部结构的动力特性有十分重要的影响，尤其当地基具有非均质特性和各向异性特性时，相关研究依然存在着大量亟需解决的问题，其对结构-地基动力相互作用的影响机理也有待于进一步的研究。本项目基于对复杂层状地基波动方程的积分变换，结合对偶方程和精细积分算法的应用，深入研究结构与复杂地基相互作用问题。主要研究内容包括：给出复杂层状地基自由场位移和应力动力响应的严密解；建立结构-复杂地基动力相互作用求解的高效率、高精度数值模型；在此基础上研究复杂地基非均质特性和各向异性特性对结构-地基相互作用的影响机制。本项研究对于复杂层状地基上结构设计和抗震安全评价有重要的科学意义和研究价值。

结构-地基动力相互作用求解是核电结构、大坝、桥梁以及高层建筑等抗震安全评价的重要内容。复杂地基对基础以及上部结构的动力特性有十分重要的影响，尤其当地基具有非均质特性和各向异性特性时，此类问题中依然存在着大量亟需解决的问题，其对结构-地基动力相互作用的影响机理也有待于进一步的研究。本项目基于对复杂层状地基波动方程的积分变换，结合对偶方程和精细积分算法的应用，深入研究结构与复杂地基相互作用问题。主要研究内容包括：给出复杂层状地基自由场位移和应力动力响应的严密解；建立结构-复杂地基动力相互作用求解的高效率、高精度数值模型；在此基础上研究复杂地基非均质特性和各向异性特性对结构-地基相互作用的影响机制；建立了一种求解粘弹性层状路面结构动力响应的数值模型。本项研究对于复杂层状地基上结构设计和抗震安全评价以及路面设计模量反算有重要的科学意义和研究价值。