质量分布不均匀的高层建筑整体稳定性分析
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摘要
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-Δ effect 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-Δ effect 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-Δ effect increase can also be controlled within a reasonable range, the structure has reasonable overall stability.
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-Δ effect 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-Δ effect 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-Δ effect increase can also be controlled within a reasonable range, the structure has reasonable overall stability.
引文
[1]黄吉锋,徐培福,陈富升.不均匀竖向荷载作用下弯曲型高层建筑的整体稳定验算[J].建筑结构,2018,48(24):53-58.
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[2]高层建筑混凝土结构技术规程:JGJ3—2002[S].北京:中国建筑工业出版社, 2001.
[3]陆天天,赵昕,丁洁民,等.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[J].建筑结构学报,2011, 32(7):8-14.
[4]艾奕康设计与咨询(深圳)有限公司.星河雅宝高科创新园三地块3-1栋?四A地块4-1栋超限高层建筑工程抗震设计可行性论证报告[R]. 2018.
[5]徐培福,肖从真.高层建筑混凝土结构的稳定设计[J].建筑结构, 2001, 31(8):69-72.