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位于北京的中国国际贸易中心三期主塔楼高330m,包括一座五星级酒店和甲级写字楼。结构设计的主要难点是在北京这一高烈度地区建设超高层大楼,如何能综合考虑结构的安全性与经济性的要求,在结构设计过程中,各种结构类型及不同材料的使用都经过讨论研究。最终的结构体系是一个组合支撑框架核心筒和组合周边刚性框架筒,在机电层再辅以伸臂桁架连接内外筒。由于塔楼外立面宽度逐渐收小,结构上采用了3层腰桁架,而在腰桁架之间柱子的数量逐渐减少。塔楼的底部是8层高带转换桁架的V型柱,既符合建筑上对五星级酒店和甲级写字楼首层宏大的主入口的要求,同时又可平缓地过渡到上部的抗弯刚架。结构体系中根据不同的部位相对采用了各种类型的组合构件来满足刚度,延性以及冗余度的要求,并达到最好的性能价格比。工程大规模应用了组合钢板墙(C-SPW)这一新型结构体系,以增加剪力墙的抗剪承载力和刚度,并改善延性。结构设计中运用了有限元分析及非线性弹塑性时程分析来评估结构的性能及确保建筑物在不同地震水准下的安全性。
The three-phase main tower of China World Trade Center in Beijing is 330m high, including a five-star hotel and Grade A office building. The main difficulty of structural design is how to construct the super high-rise building in this high-intensity area in Beijing. How to consider the safety and economy of the structure synthetically? In the process of structure design, various types of structures and the use of different materials are discussed the study. The final structural system is a combination of support frame core tube and the combination of rigid frame around the cylinder, in the electromechanical layer and then by the boom truss to connect the inner and outer cylinder. As the tower façade width gradually smaller, the structure of the three-tier waist trusses, and the number of pillars between the waist truss gradually reduced. At the bottom of the tower is a V-shaped column of 8-storey high-conversion trusses that meets the architectural requirements of the ambitious main entrance of five-star hotels and Grade A offices while smoothly transitioning to the upper quarter frame . Structural systems in accordance with the different parts of the relative use of various types of composite components to meet the stiffness, ductility and redundancy requirements, and achieve the best cost performance. A new type of C-SPW structural system has been applied on a large scale to increase the shear strength and stiffness of shear walls and to improve ductility. Finite element analysis and nonlinear elasto-plastic time history analysis are used in the structural design to evaluate the performance of the structure and to ensure the safety of the building under different seismic levels.