考虑板式节点刚度的大跨度铝合金单层网壳稳定承载力  

Stability bearing capacity of long-span aluminum alloy single-layer reticulated shells accounting for rigidity of gusset joints

作　　者：刘健 周家伟[2,3] 汪儒灏 郑晓清 赵阳[1] LIU Jian;ZHOU Jiawei;WANG Ruhao;ZHENG Xiaoqing;ZHAO Yang(Space Structures Research Center,Zhejiang University,Hangzhou 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310012,China;The Architectural Design&Research Institute of Zhejiang University Co.,Ltd,Hangzhou 310012,China)

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058 [2]浙江大学平衡建筑研究中心,浙江杭州310012 [3]浙江大学建筑设计研究院有限公司,浙江杭州310012

出　　处：《建筑结构学报》2022年第S01期10-19,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(52078452,51778567);浙江大学平衡建筑研究中心科研项目;住房和城乡建设部研究开发项目(K20200709)

摘　　要：针对大型圆柱形储罐(直径60、80、100 m)顶盖的凯威特型铝合金单层网壳结构,通过精细化数值模拟得到板式节点的弯矩-转角关系曲线。基于空间梁单元-虚拟弹簧单元模型,将节点半刚性性能引入单层网壳的有限元模型,对不同跨度、矢跨比、网格形式的铝合金单层网壳的整体稳定性能进行近1500个算例的参数分析。结果表明:节点半刚性、材料非线性和几何初始缺陷都会导致板式节点凯威特型铝合金单层网壳的稳定承载力降低;材料非线性和节点半刚性的影响较小,对网壳稳定承载力的削弱程度分别小于8%和16%;几何初始缺陷的影响较大,对网壳稳定承载力的削弱程度为50%~65%。在此基础上,拟合得到考虑节点刚度、几何非线性、材料非线性和初始几何缺陷等因素影响的板式节点凯威特型铝合金单层网壳稳定承载力计算式,可用于储罐结构中铝合金网壳的选型设计。Aming at the aluminum alloy Kiewitt-type single-layer reticulated shell structures applied to the roof of large cylindrical storage tanks(with diameters of 60 m,80 m,and 100 m),the bending moment-rotation curves of gusset joints were obtained by fine numerical simulation.Based on the space beam element-virtual spring element model,the semi-rigid behavior of joints was introduced to the finite element model of reticulated shells,and a large-scale parametric study including nearly 1500 numerical examples was carried out to analyze the stability behavior of aluminum alloy single-layer reticulated shells with different spans,rise-to-span ratios,and grid forms.The results show that the semi-rigidity of joints,material nonlinearity,and initial geometric imperfections lead to the reduction of stability capacity of aluminum alloy single-layer reticulated shells with gusset joints.The effects of material nonlinearity and joint semi-rigidity are relatively small,and their reduction degree of stability capacity is less than 8%and 16%,respectively.Initial geometric imperfections have a great influence,and the stability capacity is weakened by 50%-65%.On this basis,the calculation formula of stability capacity of Kiewitt-type aluminum alloy single-layer reticulated shells considering the effects of joint rigidity,geometric nonlinearity,material nonlinearity,and initial geometric imperfections is obtained by regression,which is convenient for the structural selection design of aluminum alloy reticulated shells in storage tanks.

关 键 词：铝合金单层网壳 板式节点 半刚性性能 非线性分析 稳定承载力 

分 类 号：TU395[建筑科学—结构工程]