［摘要］结构的侧向刚度和重力荷载之比即刚重比，是反映结构整体稳定性的关键参数。当高层建筑的高宽比足够大时，结构的刚重比一般接近规范规定的下限值，甚至低于下限值，计算的刚重比的准确性就显得非常重要。着重分析了弯剪型结构整体稳定性验算时存在的问题，比较结构顶点位移在考虑重力P-Δ效应前后的变化，以及其与刚重比及结构屈曲临界荷载系数的关系，提出了补充验算结构整体稳定性的建议。

［关键词］高层建筑；整体稳定性；刚重比；结构顶点位移；屈曲分析

中图分类号：TU973文献标识码：A文章编号：1002-848X(2012)06-0127-05

 

Wang Guo' an      (AECOM Architecture Design Company in Shenzhen, Shenzhen 518059, China)

 

Abstract: The rigidity-to-gravity ratio of structures is defined as the ratio of lateral stiffness to gravity, which is a key parameter to the global stability of structures. If the height-width ratio of the high-rise building is large enough，the structural rigidity-to-gravity ratio is normally closed to the lower limit value provided by the code, even below the lower limit. In this case, the accuracy of calculating the rigidity-to-gravity ratio seems to be essential. The problem existed in checking global stability of flexure-shearing structures was analyzed. The relationships between the variation of the structural peak displacement before or after the P-Δ effect and the rigidity-to-gravity ratio as well as critical buckling load factor of structures were discussed. Suggestions to complement the examination of overall structural stability were also proposed.

Keywords: tall building; global stability; rigidity-to-gravity ratio; structural peak displacement; critical buckling analysis

作者简介：王国安，高级工程师，一级注册结构工程师，Email:guoan.wang@aecom.com.

 

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