K6型单层球面网壳整体交互耦合屈曲行为  

Global Interactive Buckling Behaviour of K6 Single-layer Spherical Reticulated Shells

作　　者：毋凯冬 张业成 伞冰冰[1] 罗永峰[2] WU Kaidong;ZHANG Yecheng;SAN Bingbing;LUO Yongfeng(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]同济大学土木工程学院,上海200092

出　　处：《同济大学学报（自然科学版）》2024年第4期557-566,共10页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(52208161,51978240);中央高校基本科研业务费专项资金(B220201017)。

摘　　要：采用有限元数值模拟,基于K6型单层球面网壳的屈曲与后屈曲性态,提出整体屈曲的判别准则,并首次从变形特征角度分析两种整体屈曲模态交互耦合的发生机理及对屈曲承载力的削弱效应。研究结果表明,K6型单层球面网壳的稳定性易受整体交互耦合屈曲影响,且可导致屈曲极限承载力的显著削弱及不稳定后屈曲;其变形模式从屈曲阶段的最低阶整体屈曲模态主导,演化为初始后屈曲阶段的整体交互耦合屈曲模态主导,及最终的次低阶整体屈曲模态主导,是交互耦合屈曲产生的原因;缺陷幅值也会影响整体交互耦合屈曲对K6型单层球面网壳屈曲极限性能的主导作用。Using finite element modelling,this paper investigates the buckling and post-buckling behavior of K6 single-layer spherical reticulated shells.Based on the proposed criterion to distinguish global buckling modes,the mechanism and load-carrying capacity reduction of global two-modal interaction is revealed from the perspective of deformation.The results show that the stability of K6 single-layer spherical reticulated shells is vulnerable to global interactive buckling,which may lead to significant load-carrying capacity reduction and unstable post-buckling behavior because of the deformation transition from first global eigenmode dominance at the buckling stage to global interactive mode dominance and second global eigenmode dominance at the initial and final post-buckling stages respectively.Imperfection amplitudes can affect the dominance of global interactive buckling for the ultimate behavior.

关 键 词：空间结构 网壳结构 有限元模拟 耦合屈曲 非线性稳定 

分 类 号：TU393.3[建筑科学—结构工程]