基于土层集总参数模型的土-结构动力相互作用分析

Soil-structure interaction analysis based on the soil lumped parameters model

在土-结构动力相互作用简化分析中,基于弹性半无限地基的假定,采用双自由度集总参数模型来简化土层,建立了基于土层集总参数模型的土-结构动力相互作用的分析模型,主要研究了不同土层对上部结构地震反应的影响.分析了在中硬、中软两种场地上5层和15层结构的地震反应,并与刚性基础假定下同样结构的地震反应分析比较.结果表明,对比较刚性的结构考虑土-结构相互作用可能存在一定的有利因素;对高层建筑,土-结构相互作用可能导致结构在地震作用下的层间变形较大幅度增加,是不利因素.

Based on the assumption of elastic half-space a 2D lumped parameters model was used to simplify soil foundation. An analysis model of soil-structure interaction was constructed based on the soil physical model for mainly studying the interaction between subsoil and superstructure. The seismic responses of both a 5-floors building and a IS-floors building were analyzed. The results obtained from the 2D lumped parameters model of both medium hard site and medium soft site were some valuable conclusions were obtained. compared with those derived from the rigid foundation model.