节点刚度缺陷对柱面索撑网壳稳定性的影响  

Influence of joint stiffness defects on stability of cylindrical cable-stiffened latticed shells

作　　者：曹正罡[1,2] 龙振飞 赵林 李展熇[3] 孙瑛 CAO Zhenggang;LONG Zhenfei;ZHAO Lin;LI Zhanhe;SUN Ying(Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology),Ministry of Education,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters(Harbin Institute of Technology),Ministry of Industry and Information Technology,Harbin 150090,China;School of Civil Engineering,Central South University,Changsha 410083,China)

机构地区：[1]结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨150090 [2]土木工程智能防灾减灾工业和信息化部重点实验室(哈尔滨工业大学),哈尔滨150090 [3]中南大学土木工程学院,长沙410083

出　　处：《哈尔滨工业大学学报》2022年第4期118-123,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金面上项目(51878218)。

摘　　要：为研究装配式节点的初始刚度缺陷对索撑网壳稳定性能的影响,分别对各节点具有相同刚度偏差和随机刚度偏差的柱面索撑网壳进行了非线性全过程计算,分析了结构的失稳机理与破坏模式。并基于节点刚度不对称度β的概念,提出了柱面索撑网壳失稳模式的判别方法,为初始刚度缺陷的控制标准提供了依据。研究结果表明:对于沿两纵边支承的柱面索撑网壳,考虑节点半刚性的稳定承载力相比于理想刚接结构下降了15%;半刚接柱面索撑网壳对随机节点刚度缺陷较敏感,当随机缺陷的最大幅值为初始刚度的2%时,极限承载力相比于无缺陷的半刚接结构最多下降了36%;由于节点刚度的不对称分布,导致了柱面索撑网壳可能发生正对称失稳或反对称失稳两种模式,且当节点刚度不对称度大于1时,结构将从正对称失稳转变为反对称失稳,承载力随之下降30%左右。To study the influence of the initial stiffness defects of assembled joints on the stability of cable-stiffened latticed shells,the nonlinear full-range analysis of cylindrical cable-stiffened latticed shells was carried out,considering joints with same stiffness deviation and random stiffness deviation.The instability mechanism and failure modes of the structures were analyzed.The instability mode identification method was proposed based on the asymmetry degreeβof joint stiffness,providing a basis for the control standard of initial stiffness defects.Results show that for the cylindrical cable-stiffened latticed shells supported along the two longitudinal sides,the stability bearing capacity of the structure with semi-rigid joints was 15%lower than that of the structure with ideal rigid joints.Besides,the cylindrical cable-stiffened latticed shells with semi-rigid joints were more sensitive to random stiffness defects.When the maximum amplitude of the random stiffness defect was 2%of the initial stiffness,the ultimate bearing capacity decreased by at most 36%compared with the semi-rigidly connected structure without defects.Due to the asymmetric distribution of jonit stiffness in cylindrical cable-stiffened latticed shells,two modes of positive symmetric and antisymmetric instability might occur.When the asymmetry degree of joint stiffness was greater than 1,the structure changed from positive symmetric instability to antisymmetric instability,and the bearing capacity decreased by about 30%.

关 键 词：空间结构体系 柱面索撑网壳 节点刚度缺陷 失稳模式 稳定承载力 

分 类 号：TU393.3[建筑科学—结构工程]