双层柱面网壳与下部支承静力相互作用研究
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摘要
柱面网壳结构由于可以提供优美的外形以及开阔的内部空间,越来越多地应用于大跨度空间结构。本文基于MST空间结构设计软件,针对方形平面双层柱面网壳,系统考察了不同支承条件下网壳杆件的内力变化与支承侧向反力、结构位移等静力响应,并在此基础上对结构用钢量进行了优化。分析结果显示,结构采用固定支承时上下弦杆件皆受压;弹性支承时上弦受压、下弦受拉;固定与弹性支承两种情况下,腹杆内力方向相反。结构用钢量、内力、支承侧向反力随着支承刚度增加呈减小趋势。同时,支承侧向刚度在1.26~1.67 k N/mm时,结构响应对支承刚度变化最敏感。
More and more cylindrical lattice has been applied in practice because of its beautiful appearance and spacious internal space. This paper presents the static responses of the double-layer cylindrical lattice shell equipped with different supports by a structure design software,MST. The static properties include internal force,nodal displacement,support reaction and so on. Based on the properties,the steel volume of the structure has been optimized. When the structure is equipped with fixed hinge bearings,the upper and lower chords of the reticulated shell are in compression. The top chord is tensile and lower is compress,after the elastic supports replaced the fixed ones. In the process of this change,the internal force produced by web member is of opposite direction. Besides that,the static responses such as steel dosage,internal force and support reaction show a trend of decrease with the increase of bearing stiffness. Under the condition of the horizontal stiffness located in the interval 1. 26 ~ 1. 67 k N / mm,the static responses of the shell are most sensitive to the bearing stiffness.
More and more cylindrical lattice has been applied in practice because of its beautiful appearance and spacious internal space. This paper presents the static responses of the double-layer cylindrical lattice shell equipped with different supports by a structure design software,MST. The static properties include internal force,nodal displacement,support reaction and so on. Based on the properties,the steel volume of the structure has been optimized. When the structure is equipped with fixed hinge bearings,the upper and lower chords of the reticulated shell are in compression. The top chord is tensile and lower is compress,after the elastic supports replaced the fixed ones. In the process of this change,the internal force produced by web member is of opposite direction. Besides that,the static responses such as steel dosage,internal force and support reaction show a trend of decrease with the increase of bearing stiffness. Under the condition of the horizontal stiffness located in the interval 1. 26 ~ 1. 67 k N / mm,the static responses of the shell are most sensitive to the bearing stiffness.
引文
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[2]曹资,张毅刚.单层球面网壳地震反映特征分析[J].建筑结构,1998(8):40-43.
[3]曹资,张超,张毅刚.网壳屋盖与下部支承结构动力相互作用研究[J].空间结构,2001,7(2):19-26.
[4]赵鹏飞.空间网格结构技术规程理解与应用[M].北京:中国建筑工业出版社,2013.
[5]严慧,董石麟.板式橡胶支座节点的设计与应用研究[J].空间结构,1995,1(2):33-40.
[6]GB50017—2003钢结构设计规范[S].
[7]GB/T17395—2008无缝钢管尺寸、外形、重量及允许偏差[S].
[8]陈志华.弦支穹顶结构[M].北京:科学技术出版社,2010.
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