某高层悬挂结构地震响应分析

SEISMIC RESPONSE ANALYSIS OF A HIGH-RISE SUSPENDED STRUCTURE

为实现首层广阔的公共开放空间,上海某高层建筑采用屋顶桁架悬挂20层办公楼层。为正确地评估该高层悬挂结构在罕遇地震活动下的弹塑性行为,研究在罕遇地震下的变形形态和构件损伤情况,文中利用ETABS分析软件,选取7组7度50年超越概率2%的地震波三向输入,考虑材料非线性和几何非线性,对该结构进行罕遇地震弹塑性时程分析。分析结果表明,结构在罕遇地震下的弹塑性层间位移角满足规范要求,无严重破坏或者倒塌,罕遇地震下性能表现合理可靠。可为相关悬挂结构设计提供参考与借鉴。

A high-rise building with 20 office floors suspended from roof truss has been designed in Shanghai to re⁃alize a vast public open space on the first floor.In order to evaluate the elastic-plastic behavior of the high-rise sus⁃pended structure under rare earthquakes and study deformation form and component damage under rare earth⁃quakes,seven groups of Zone 7 EQ waves with 50-year exceedance probabilities 2 are selected to conduct rare earth⁃quake elastic-plastic time history analysis considering material nonlinearity and geometric nonlinearity.The analy⁃sis results show that the elastic-plastic story drift of the structure under rare earthquakes meets the code limit,and the response of the building under the rare earthquake is acceptable,in which the building does not suffer significant damage or collapse,providing the reference for high-rise suspended structure.