高层建筑结构整体稳定性研究

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。

Research on structural stability of tall buildings

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.