地铁上盖开发的层间隔震结构设计
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（1 天津大学建筑工程学院， 天津 300072； 2 天津大学建筑设计研究院， 天津 300073）
［摘要］基于设防目标，对天津某地铁上盖采用层间隔震技术的高层建筑选择隔震支座和地震波，通过ETABS软件中的Isolator1隔震单元和Gap缝单元并联模拟隔震支座以解决其拉压刚度不一致的问题，在考虑支座非线性的情况下进行了设防地震和罕遇地震下的动力时程分析，并根据规范进行各项指标的验算。结果表明，上部隔震结构每一层的剪力比和倾覆力矩比按照层数从低到高呈减小再增大的趋势。上部结构的水平减震系数为0.38，可以达到降低设防烈度半度进行设计的目的；隔震支座在罕遇地震下的拉应力、支座变形没有超过规范限值；隔震后下部结构的减震效果不明显。［关键词］地铁上盖; 隔震结构; 橡胶支座; 水平减震系数中图分类号：TU352.1+2 文献标识码：A 文章编号：1002-848X(2015)16-0077-05
Design of story isolation structure on the subway platformDing Yongjun1,2, Zhao Mingyang1, Li Jinjun2（1 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 Architectural Design and Research Institute of Tianjin University, Tianjin 300073, China）Abstract: Based on the fortification target, the isolation bearings and seismic waves were selected for a high-rise building which adopted story isolation technology on the subway platform in Tianjin. The parallel connection of the Isolator1 element and Gap element in the ETABS software was used to simulate the different pulling and pushing stiffness of rubber isolator. Considering the nonlinearity of bearings, dynamic time-history analyses under fortification earthquake and rare earthquake were carried out. Checking calculations were also conducted according to the code. The results show that the shear ratio and moment ratio decrease and then increase according to the number of layers from low to high. The horizontal seismic reduction coefficient of the isolation structure is 0.38, which can satisfy the demand of reducing half degree of the fortification intensity when designing the upper structure. The tensile stress and bearing deformation don't exceed the limit value of the code, and the horizontal earthquake response reduction of lower structure is not obvious.Keywords: subway platform; isolation structure; rubber isolator; horizontal seismic reduction coefficient
作者简介：丁永君，硕士，研究员，Email:tju_yj@163.com。
