上海国际设计中心超限高层结构抗震分析

Seismic Performance Evaluation of Shanghai International Design Center: an Out-of-Codes High-Rise Building

超限高层建筑在地震作用下结构反应复杂,计算分析和结构设计缺乏相应规范作参考。上海国际设计中心是其中一典型实例,表现在平面规则性超限(楼板不连续)和立面规则性超限(不等高双塔连体结构)。文中运用SAP2000有限元分析软件构建出此结构的力学模型,采用振型分解反应谱法和弹性时程分析法对此结构进行了地震反应计算,并针对相关抗震性能指标做出了对比分析。分析的结果表明连体对结构的侧向刚度、扭转状况均产生了影响,而竖向刚度较小的连体楼板在竖向地震作用下反应较大。

The behavior of the out-of-codes high rise buildings is complicated subjected to earthquake excitation, and current seismic code provisions present limited information for their design criteria. Shanghai International Design Center （SHIDC） is an exact example of this type, with irregularity in layout （floor discontinuity） and in elevation （different-height connected building）. A SAP2000 computer model of this building was thus built, based on which, the seismic performance of SHIDC was evaluated by response spectrum analysis and elastic time history analysis. The results of the analysis demonstrate that the connecting truss produces great influence on the lateral stiffness and the torsional response of the structure, and the response behavior of the connecting floor is relatively significant because of its lower vertical stiffness.