邻近地上结构对地下结构动力响应的影响参数

Parametric Study of Influence of Surrounding Superstructure on Infrastructure's Dynamic Response

采用有限单元法建立了一系列典型高层框架结构及地下车站的二维平面应变模型,研究了不同地震波输入、结构间距、土层刚度、土层阻尼比及地上结构基础埋深、楼层数、刚度等工况下地上结构对地下结构动力响应的影响.分析结果表明,地震波频谱成分的影响很大;随着结构间距增加,相互作用迅速减小;随着土层阻尼比减小、基础埋深增加、楼层数增加,相互作用增大;地上结构上部刚度对相互作用程度的影响不大.

Based on finite element method, a series of two- dimensional plane strain models of typical framework and underground station were built to study the influence of superstructure on infrastructure＇s dynamic response with various ground motion inputs, spacing between constructions, stiffness and damping of subsoil, foundation buried depth and floor and stiffness of superstructure. Results show that earthquake wave exerts a tremendous influence. Interaction diminishes rapidly with the increasing of the structure gap when the damping of subsoil decreases and the foundation buried depth and floors＇ number of superstructure increases, interaction gradually augments. The effect of superstructure＇s stiffness on interaction is negligible.