考虑施工误差的大开孔悬挑网壳结构稳定性  

Stability of large opening cantilever reticulated shell considering construction error

作　　者：王秀丽[1,2] 王康 张孝斌 王贵生 WANG Xiu-li;WANG Kang;ZHANG Xiao-bin;WANG Gui-sheng(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Northwest Research Center of Disaster Prevention and Mitigation in Civil Engineering,MOE,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Yiyan Construction Technology Group Co.,LTD,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]甘肃一安建设科技集团有限公司,甘肃兰州730050

出　　处：《空间结构》2021年第4期21-27,共7页Spatial Structures

基　　金：国家自然科学基金项目(51778273)。

摘　　要：以某大开孔悬挑网壳结构为工程背景,利用有限元软件ANSYS进行荷载-位移非线性全过程分析,研究初始几何缺陷分布模式、缺陷大小和节点刚度对结构稳定性的影响.研究表明,利用几何非线性进行缺陷分析,当初始几何缺陷分布模式为一致缺陷模态和静力失稳模态时,得到的稳定极限荷载相近;利用双重非线性进行缺陷分析时,初始几何缺陷分布模式为一致缺陷模态是最不利的;考虑双重非线性引入不同大小的初始几何缺陷进行分析时,随着初始几何缺陷的增加,稳定极限荷载逐渐减小;利用双重非线性进行刚度分析时,随着节点连接刚度的降低,屈曲后的承载能力逐渐降低.This study takes a large opening cantilevered reticulated shell structure as an engineering background. In order to study the influence of initial geometric imperfection distribution mode, imperfection size and joint stiffness on the stability of the structure, a nonlinear full-process analysis of load and displacement was carried out by using finite element software ANSYS. The results show that considering geometric nonlinearity for imperfection analysis, when the initial geometric imperfection distribution mode is in uniform imperfection mode and static instability mode, the obtained stability limit loads are similar. When double nonlinearity is used for imperfection analysis, the distribution mode of initial geometric imperfection is in uniform imperfection mode, which is the most unfavorable. When considering double nonlinearity and introducing different initial geometric imperfection for analysis, the stability limit load gradually decreases with the increase of initial imperfection. When stiffness analysis is carried out by using double nonlinearity, the bearing capacity after buckling gradually decreases as the joint stiffness decreases.

关 键 词：大开孔悬挑网壳结构 初始几何缺陷 一致缺陷模态 静力失稳模态 节点刚度 

分 类 号：TU393.3[建筑科学—结构工程]