不同土性地基考虑 ＳＳＩ效应的隔震结构地震响应分析

为探究不同土性地基的ＳＳＩ效应对层间隔震结构影响机理与动力响应规律，选取一个典型层间隔震结构，对其简化并制作缩尺模型，采用振动台试验的方法，分别在硬土、软土这两种地基上单向输入4条地震波来研究模型的动力响应。结果表明:土体具有明显的放大效应，随着地基土由硬变软，隔震结构周期延长倍数降低。隔震结构在硬土地基上能发挥较好的减震效果，而软土地基上减震效果明显减弱。软土地基上塔楼的动力响应较硬土地基增大，塔楼容易成为薄弱部位，其抗震设计应重点关注。

Seismic Response Analysis of Isolated Structure Considering Soil-structure Interaction on Various Soil Foundations

In order to explore the influence mechanism and dynamic response law of soil-structure interaction(SSI)of various soil foundations on the inter-story isolated structure,a typical isolated structure was selected to develop a small-scale model.The method of shaking table test is used to analyze the dynamic response of the model by inputting 4 ordinary ground motions in one direction of hard soil and soft soil respectively.The results show that soil has obvious amplification effects.As the soil foundation changes from hard to soft,the period extension ratio of the isolated structure decreases.The isolation structure can play a better damping effect on the hard foundation,while the damping effect on the soft foundation is obviously weakened.The dynamic response of the tower on soft soil foundation is larger than that on hard soil foundation,which makes the tower easy to become a weak part,therefore close attention should be paid on its seismic design.