设备周期比对设备-结构耦合隔震体系近断层地震响应影响分析

Analysis of influence of equipment period ratio on near fault seismic response of equipment-structure coupled isolation system

设备-基础隔震结构耦合体系的地震响应影响因素较多,为研究设备与基础隔震结构的周期比对耦合体系地震响应的影响,利用有限元软件Abaqus建立了一个5层钢框架隔震结构模型,将设备设置于结构顶层,输入3条近断层地震波,分析设备与结构周期比变化对耦合隔震体系的隔震层位移、楼层层间位移、楼层加速度和设备位移等动力响应的影响。结果表明,随着设备周期与结构基本周期接近,隔震层位移、楼层层间位移、楼层加速度呈逐渐减小的趋势,设备位移呈增大趋势;设备与结构间的耦合作用可减小结构和设备的动力响应,在设备周期接近结构周期时较为明显,隔震层位移、楼层层间位移、结构加速度和设备位移可分别减小26.92%、27.18%、14.34%、9.63%。

The seismic response of equipment-structure coupling isolation system is affected by many factors.In order to study the effect of the period ratio of equipment and structure on the seismic response of the coupled isolation system,a five story steel frame isolation structure was established by Abaqus and the equipment was coupled to the top of the structure.Three near fault seismic waves were input.The influence of the equipment period ratio on the dynamic response of the coupled isolation system was analyzed,such as the displacement of the isolation layer,the displacement between floors,the acceleration of the floor and the displacement of the equipment.The results show that as the equipment period approaches the structural period,the isolation layer displacement,the displacement between floors and floor acceleration gradually decrease,and the equipment displacement increases;The coupling effect between equipment and structure can reduce the dynamic response of structure and equipment,which is more obvious when the equipment period is close to the structure period.The displacement of the isolation layer,the displacement between floors,the acceleration of the floor and the displacement of the equipment can be reduced by 26.92%,27.18%,14.34%,and 9.63%respectively.