隔震层附加黏滞阻尼器对高层建筑基础隔震结构动力响应影响

Influence of viscous dampers attached to isolation layer on dynamic response of high-rise foundation isolation structure

隔震层附加黏滞阻尼器对高层基础隔震结构的动力响应影响研究较少。以某地医院15层病房楼为对象,选取隔震层附加黏滞阻尼器前后两种结构,进行三向地震动的弹塑性时程分析。结果表明,隔震层附加黏滞阻尼器后层间剪力增幅可达21.3%;首层层间位移角减小15%左右,中上部楼层层间位移角增加约4%左右;隔震层位移减小可达33.6%,可以有效降低隔震支座拉应力,但对压应力影响不明显。

There are few researches on the influence of viscous dampers attached to isolation layer on dynamic response of high-rise foundation isolation structure.A 15-floor ward building in a hospital was selected as the object,and two kinds of structures before and after the isolation layer with viscous damper were selected to analyze the elastic-plastic time history of three-directional ground motion.The results show that the interlayer shear force increases by 21.3%when the viscous damper is added to the isolation layer.The first floor story drift decreases about 15%,and the middle and upper floors story drift increases about 4%.The displacement of the isolation layer can be reduced by 33.6%,which can effectively reduce the tensile stress of the isolator units,but has no obvious effect on the compressive stress.