高层隔震结构扭转分析  

Study on torsion of high-rise isolation structures

作　　者：祁皑[1] 商昊江[1] 范宏伟[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《世界地震工程》2011年第1期121-130,共10页World Earthquake Engineering

基　　金：福建省科技厅重点项目(2007Y0025)

摘　　要：为研究高层隔震结构在地震作用下的扭转效应,用Etabs软件建立1个高层抗震结构和4个具有不同扭转特性的高层隔震结构的空间模型进行地震响应分析,以验证此原则"上部结构质量中心与隔震层刚度中心的重合与否"对结构扭转效应的影响程度,而后考察偏心高层隔震结构在偶然偏心地震作用下结构的扭转效应。结果表明:由于地震作用的减小,扭转效应要远小于原抗震结构,且隔震本身对于结构扭转效应的抑制效果要好于上述原则;扭转效应的减震率大于平动效应的减震率。布置在隔震层平面外围的铅芯橡胶隔震支座对隔震层的扭转有一定的控制作用。To study the torsional effect of high-rise isolation structure under seismic action, with Etabs software spatial models of a high-rise seismic structure and 4 high-rise isolation structures which have different torsional properties are established, and comparative seismic response analyses of the above-metioned 5 models are done to check up the influence of ＂the upper structure mass center coincident with the isolation layer rigidity center or not＂ on the torsion inhibition of the high-rise isolation structures. Then the torsional effect of the high-rise isolation structure under accidental eccentric seismic action is observed in the case that upper structure mass center and the isolation layer rigidity center is not coincident. The results show that as the intensity of earthquakes decreases, torsion effect is far smaller than the original seismic structure and the isolation itself has better inhibitory effect to torsion than the case of the upper structure mass center coincident with the isolation layer rigidity center; the isolation rate of torsion is greater than the isolation rate of translation. Lead rubber bearings arranged in the periphery of isolation layer plane have some control effect on the torsion of isolation layer.

关 键 词：高层隔震结构 扭转控制 质量中心 刚度中心 偶然偏心 铅芯橡胶支座 

分 类 号：TU352[建筑科学—结构工程] P315.966[天文地球—地震学]