异形单层网壳结构的整体稳定性研究及关键节点分析  

Study on overall stability of special-shaped single-layer reticulatedshell structure and its tubular joint analysis

作　　者：马宏伟[1] 徐健聪 吴文斌 莫振忠 MA Hongwei;XU Jiancong;WU Wenbin;MO Zhenzhong(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;Guangdong Tingxu Construction Engineering Co.,Ltd.,Guangzhou 510641,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]广东廷旭建筑工程有限公司,广东广州510641

出　　处：《西安建筑科技大学学报（自然科学版）》2024年第1期47-56,共10页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：亚热带建筑科学国家重点实验室开放课题(2018ZB29)。

摘　　要：单层网壳结构属于缺陷敏感结构,整体稳定问题是结构设计的关键.单层网壳结构可以采用空间相贯节点,有必要对节点进行三维实体有限元分析,在此基础上研究节点的力学性能.本文总结了单层网壳结构整体稳定分析的方法,归纳了空间相贯节点三维实体有限元分析方法;针对异形单层网壳结构,研究了结构的静力性能、结构网格与建筑形状对结构承载能力的影响,确定了结构的弹性稳定承载力和弹塑性稳定承载力;对空间相贯节点进行了有限元分析,得到节点处应力的分布情况,并研究了节点隐蔽部位有无焊缝对节点力学性能的影响.结果表明:异形单层网壳的曲率变化和结构网格对关键部位处杆件受力影响较大;稳定承载力对单层网壳结构起控制作用,对此异形单层网壳进行弹塑性稳定分析,结构安全系数达到24;隐蔽部位焊缝对节点承载力的影响较大,设置隐蔽部位焊缝后,节点处各杆件的最大应力可减小20%以上.The single-layer reticulated shell structure is a defect-sensitive structure,and the overall stability is the key to structural design.Multiplanar tubular joints can be used in single-layer reticulated shell structures,so it is necessary to carry out three-dimensional solid finite element analysis of the joints,and study the mechanical properties of the joints on this basis.In this paper,the overall stability analysis method of single-layer reticulated shell structure and the three-dimensional solid finite element analysis method of multiplanar tubular joints are summarized.For the special-shaped single-layer reticulated shell structure,the static performance of the structure,the influence of structural grid and building shape on the structural bearing capacity are studied,and the elastic stability bearing capacity and the elasto-plastic stability bearing capacity of the structure are determined.The finite element analysis of multiplanar tubular joints is carried out to obtain the stress distribution of the joints,and the influence of the hidden part of the joints with or without welds on the mechanical properties of the joints is studied.The results show that the curvature change and structure mesh of the special-shaped single-layer reticulated shell have a great influence on the stress of key members,and the stability bearing capacity plays a controlling role in the single-layer reticulated shell structure.The elasto-plastic stability analysis of the special-shaped single-layer reticulated shell shows that the structural safety factor reaches 24.The weld in the hidden part has a great influence on the bearing capacity of the joint,so after setting the weld in the hidden part,the maximum stress of each member of one joint can be reduced by more than 20%.

关 键 词：单层网壳结构 整体稳定 相贯节点 有限元分析 

分 类 号：TU392.3[建筑科学—结构工程]