质量分布不均匀的高层建筑整体稳定性分析

Overall stability analysis of high-rise structure with the uneven mass distribution

刚重比是高层建筑结构设计中的重要指标之一,规范给出的刚重比计算公式适用于质量分布沿高度相对均匀的结构。探讨了刚重比与重力二阶效应增幅和临界屈曲荷载因子的关系,并结合实际工程,对超高层建筑竖向荷载从下到上显著变化时,根据建筑体型和荷载分布情况,对刚重比进行修正;同时对结构进行重力P-Δ效应增幅和整体屈曲分析。分析结果表明,修正后的结构刚重比可满足规范要求,重力P-Δ效应增幅也能控制在合理范围之内,结构整体稳定满足要求。

Stiffness-gravity ratio is one of the important issues in the structural design of high-rise buildings,the formula of the stiffness-gravity ratio in technical specifications applies to structures in which the mass is relatively evenly distributed along the height.The relationship between the stiffness-gravity ratio to P-Δeffect increase and the critical buckling load factor was discussed,and combined with a super high-rise building which the vertical load changes significantly from bottom to top,according to the actual building shape and load distribution,the stiffness-gravity ratio was corrected,and P-Δeffect increase of the structure and overall buckling analysis were performed.The analysis results show that the corrected stiffness-gravity ratio can meet the specification requirements,and the P-Δeffect increase can also be controlled within a reasonable range,the structure has reasonable overall stability.