天津环渤海大饭店超限结构抗震优化设计

Seismic optimum design for ultra-limit building of Tianjin Huan Bohai Hotel

天津环渤海大饭店主楼高188.4m,采用带加强层的混合框架-核心筒结构体系。基于初始设计方案在选定的地震波下的大震弹塑性时程分析结果中出现的结构层间位移角超限、部分墙体损伤集中且较大等问题,进行了三次有针对性的结构方案调整。重点研究了核心筒墙体开洞、加强层刚度调整等措施对结构整体位移和关键构件损伤方面的影响,以及大震弹塑性时程分析方法在结构抗震优化设计过程中的应用,同时对比了有限元计算中核心筒墙体与框架梁之间采用铰接或刚接对整体结构刚度和位移的影响。最终在较为经济的条件下使结构在整体指标和构件性能两方面均达到了"大震不倒"的抗震设防目标。

Composite frame-core tube structure with outrigger and belt members is adopted in Tianjin Huan Bohai Hotel, which is 188.4 meters high. Based on the elastic-plastic time-history analysis for the preliminary design scheme under chosen earthquake waves, several problems such as inter-story displacement angle exceeding limits of the code, part of walls injured concentrated and seriously, and other issues were discovered. Three targeted structural adjustments had been conducted for the preliminary design scheme. The effects of openings of core tube and stiffness of outrigger and belt members on structural displacement and the damage of critical components were researched mainly. The application of seismic optimum design based on seismic elastic-plastic time-history analysis was introduced. The effect of hinged or rigid connection between frame beams and core tube on structural stiffness and displacement was also analyzed. The seismic precautionary target of ＇ no collapse under strong earthquake＇ can be achieved economically both in overall deformation and component performance.