超高层悬挑桁架托柱转换结构抗震性能分析

Seismic performance analysis of super high-rise building with cantilever truss conversion

重庆某超B级高层建筑,结构采用框架-核心筒结构体系,结构沿竖向高度布置桁架转换,局部竖向构件不连续。针对本工程超限问题,运用SATWE和ETABS软件对结构进行多遇地震作用下对比分析,研究了周期、位移和基底剪力等指标,结果表明各项指标满足规范要求,计算模型能够反映真实结构响应,结果合理有效。采用SAUSAGE软件对结构进行罕遇地震下的动力弹塑性时程分析,研究结构位移、基底剪力和重要结构构件的损伤情况,结果显示本结构符合双重抗侧力体系,具有较高的承载力和变性能力,悬挑桁架、筒体剪力墙、外框架等结构构件可以达到预定的抗震性能目标。

An over-B-level super-high-rise building in Chongqing adopts a frame-core tube structure. The truss layer for conversion is arranged along the vertical height which cause the local vertical members are discontinuous. Aiming at the over-limit problem of this project, we used SATWE and ETABS software to conduct a comparative analysis of the structure under frequent earthquakes, and studied the period, displacement and base shear force. The results show that the various indicators meet the code requirements, and the calculation model can reflect the real structure’s respond, results are reasonable and effective. Using SAUSAGE to perform dynamic elastic-plastic analysis of the structure under rare earthquakes. The results show that the structure conforms to the dual-lateral force system and has high bearing capacity and deformability. Structural components like the cantilevered truss, cylindrical shear wall, and external frame can achieve the predetermined seismic performance objectives.