郑州大剧院超限复杂结构抗震设计

Seismic design of out-of-code complex structure of Zhengzhou Grand Theater

郑州大剧院工程平面布置复杂,各剧场均存在局部楼层错层、楼板开大洞、竖向构件局部转换等不规则情况,属于特别复杂的高层建筑结构。结合《建筑抗震设计规范》（GB 50011—2010）的要求,采用三水准、两阶段设计方法,对主体结构进行了详细的弹性和弹塑性时程分析,对钢结构屋盖和围护桁架进行整体稳定性分析。结果表明,地震作用下主体结构具备较好的承载和变形能力,能够达到小震弹性、中震可修、大震不倒的性能指标。通过罕遇地震作用下的弹塑性时程分析,找出了结构潜在的抗震薄弱部位和薄弱构件,并提出相应的抗震加强措施,为类似工程设计提供参考。

The plane layout of the Zhengzhou Grand Theater project is complicated. There are irregular situations in all theaters of Zhengzhou Grand Theater,such as partial staggered floors,large openings in floors,and partial conversion of vertical components. Zhengzhou Grand Theater is a particularly complex high-rise building structure. Combining with the Code for seismic design of buildings（ GB 50011—2010）, ＂ three-level and two-stage＂ design principles were adopted to perform detailed elastic and elasto-plastic time-history analysis of the main structure. The overall stability analysis was performed on the steel grid roof and the enclosure truss. The results show that under the action of earthquakes,the main structure has good bearing and deformation capabilities,and can reach the performance objectives of elasticity under frequent earthquakes,repairable under fortification earthquakes,and not collapsing under rare earthquakes. Through the elasto-plastic time-history analysis under the rare earthquakes,potential weak seismic locations and weak components were identified,and corresponding seismic strengthening measures were put forward,which provided a reference for similar engineering designs.