土-结构动力相互作用对基础隔震结构的影响

基础隔震结构作为一种有效的被动控制方式,已经被广泛用于建筑结构、桥梁、核电站等工程领域中。现有规范在对其进行理论分析时通常沿用刚性地基假定,忽略土-结构相互作用(SSI);实际上结构物如果不考虑SSI会给其动力特性及地震反应的计算带来较大失真;因而有必要研究SSI对基础隔震结构的影响。视地基为均匀、各向同性的弹性半空间,采用弹簧-阻尼系统对其进行模拟;运用ANSYS有限元分析软件建立结构三维有限元模型,对不同场地类别下结构的动力特性进行了分析,研究了考虑SSI时结构的地震响应。结果表明,考虑SSI时结构的动力特性、地震响应均会受到不同程度的影响。

Influence of Soil-structure Dynamic Interaction on Base-isolation Structure

As an effective passive control method,base-isolation is widely used in the field of building structure,bridge and nuclear power plant.Existing code and theory of base-isolation don’t consider the soil-structure interaction taking a fixed-base assuming,but this assuming will make dynamics and seismic response’s calculation of structure not accurate,so it’s necessary to do research on SSI’s influence on base-isolation structure.In this analysis soil is seemed as a uniform isotropic elastic half space,it’s represented by springs and dampers.3D model is set up by ANSYS.The dynamic characteristics and seismic response of the structure under different site soil are analyzed and studied.The research indicates that: SSI will influence structure’s dynamic characteristics and seismic response.