国家体育场大跨度钢结构修改初步设计

Revised preliminary design of steel structure of National Stadium Beijing

在国家体育场修改初步设计中首次采用CAT IA软件,解决复杂建筑的空间建模问题;中厚钢板采用Q 345G J钢材,有效降低了用钢量;在进行大跨度结构计算与优化时,分别考虑了常遇地震、中震与罕遇地震作用;提出太阳辐射引起结构温升的计算方法,合理确定安装合拢温度;运用单元逐次激活的技术,进行施工过程分析;根据管桁架和次结构杆件的特点,合理确定压杆的计算长度系数;研究了在次结构薄壁箱形构件内部设置纵向加劲肋对改善板件局部稳定性及延性的影响;提出主桁架单K节点、双K节点、桁架柱带有内部加劲肋节点及铸钢转换节点构造;通过动力特性分析,确认了立面大楼梯在人群挤塞荷载下的舒适性.

CATIA software is used to build the complicated geometric model in the revised preliminary design of National Stadium Beijing. Q345GJ is adopted for thick steel plates, which reduces the structural weight effectively. The frequent earthquake, moderate earthquake and rare earthquake effects are calculated in the optimum design of the structure. A method to estimate temperature arisen from the sun radiation is presented and final erection temperature is decided reasonably. The element “death and birth” technique is employed for simulating the construction procedure. According to the structural feature of the HSS truss and the secondary structure, the effective length factors of the compressed members are defined reasonably. The effects of longitudinal stiffeners inside thin-wall box sections on the capacity of local buckling resistance and the ductility of them are studied. Details about single K-connection, double K- connection for the main truss, connections with inner stiffeners for the truss column, and the cast steel connection are provided. The acceptance of the facade staircase with dense people is guaranteed by dynamic analysis.