上海中心大厦结构整体稳定性分析及巨型柱计算长度研究

上海中心大厦是由巨型框架-核心筒-伸臂桁架抗侧力体系组成的超高层建筑，结构的稳定性备受关注。根据实际体型和荷载分布情况，采用修正算法推算了结构刚重比，同时对结构在风荷载和地震作用下的P-Δ效应进行了评估。结果表明：修正后的结构刚重比满足规范要求，P-Δ效应能控制在较低的水平之内。整体线弹性屈曲分析也进一步验证了结构具有良好的稳定性。巨型柱作为上海中心大厦的关键构件，其计算长度取值将直接影响结构设计的合理性。通过巨型框架分区模型的线弹性屈曲分析得到巨型柱的临界荷载，由欧拉公式反推出巨型柱的计算长度。图12表7参7

Stability analysis of the Shanghai Tower and research on effective length of super column

Shanghai Tower is a high-rise building composed of mega frame-core-outrigger lateral resisting system. The structural stability has been concerned widely. A modified method was used to check the rigidity-gravity ratio according to the tower’s shape and load distribution characteristics. The P-Δ effect of the structure under wind and seismic loads had also been evaluated. Calculational results show that the rigidity-gravity ratio meets the code requirements and the P-Δ effect can be controlled under a low level. The structural linear elastic buckling analysis has also been carried out to prove the good stability of the structure. Super column is one of the key components of the structure. The definition of the column’s effective length will directly affect the rationality of structural design. Based on the compartmental mega frame model, the critical load of the super column was obtained by the linear elastic buckling analysis. Then, the effective length of the super column can be calculated according to Euler Formula. 7Refs.In Chinese.