近断层地震作用下串联隔震体系下部结构层间位移角响应分析

摘要

建立了串联隔震体系模型,并编制MATLAB程序对一实际工程的下部子结构进行近断层地震响应分析.结果表明,地震动时上部子结构产生与下部子结构方向相反的作用力,使下部子结构振动明显减弱,对下部子结构运用时程分析得到最大层间位移角为1/555;随地震烈度的增大,地下室层间位移角增大,一、三类场地土上,近场地震动所得地下室层间位移角大于远场相应值,二类场地土其结果相反,且均满足框架剪力墙结构罕遇地震下层间位移角的要求.%A series isolated system model is established,and MATLAB is used to analyze the substructure response under near fault. The results show that the upper structure generated a force opposite in direction to the lower structure,so that the substructure vibration was obviously slacked. The maximum inter-story displacement angle of the substructure by means of time-history response is 1/555; when the seismic intensity increases, the inter-story displacement angle of the substructure increases. In site I and site III, the basement inter-story displacement angle in near fields during the earthquake is greater than the corresponding value of far field;the results are opposite in site II ,and they can satisfy requirements of inter-story displacement angle of the frame-shear wall in rare earthquakes.