隔震结构-设备耦合体系的楼面反应谱影响因素分析

Analysis of floor response spectrum influencing factors of isolated structure-equipment coupled system

建立隔震结构-设备耦合体系的SIMULINK动力分析模型,选取2栋实际的隔震结构和多条地震动,对隔震结构-设备耦合体系进行动力时程分析,求得楼面加速度放大系数的均值谱作为楼面反应谱,并与不考虑耦合效应的隔震结构楼面反应谱进行对比,讨论设备动力特性、隔震结构动力特性、建筑场地和设备所在楼层位置对隔震结构-设备耦合体系楼面反应谱的影响.结果表明:设备质量和阻尼越大,隔震结构-设备的耦合效应越明显,特别当设备与所在楼层的质量比超过1%时,宜考虑设备-结构的耦合作用;隔震结构动力特性、设备动力特性和场地条件均会影响楼面反应谱的谱值和谱形,但设备不同位置对楼面谱的影响很小,可忽略不计.

The dynamic analysis model of isolated structure-equipment coupled system was established in SIMULINK environment.The dynamic responses of two actual isolated structure-equipment coupled systems were calculated by time history analysis with multiple ground motions,and the mean spectrum of the floor acceleration amplification factor was obtained as the floor response spectrum,and compared with the floor response spectrum of the isolated structure without considering the coupled effect.The effects of equipment dynamic characteristics,isolated structure dynamic characteristics,building site and location of equipment on floor response spectrum of isolated structure-equipment coupled system were discussed.The results show that with the increase of equipment mass and damping,the coupled effect between isolation structure and equipment becomes more obvious.Especially when the mass ratio of equipment to floor is more than 1%,the coupled effect between equipment and structure should be considered.The dynamic characteristics of isolated structure,equipment dynamic characteristics and site conditions all affect the spectrum value and spectrum shape of floor response spectrum,but the effect of different locations of the equipment on the floor spectrum is tiny and can be neglected.