【摘要】 首先介绍桁架拱的组成特点、力学特性及工程应用,探讨拱的弹性和非弹性失稳特点及分类.结合桁架拱弹性屈曲模型、荷载作用类型及初始挠度沿轴线的分布形式,指出了桁架拱几种可能的破坏和失稳形式.在钢管桁架拱形结构失稳模态分析的基础上,利用非线性有限元分析方法,对立体管桁架拱进行了面内整体稳定承载力分析,从结构的荷载-位移全过程曲线考察了桁架拱稳定性能的基本规律,从中找到控制桁架拱设计的主要失稳形式.最后,结合南通体育会展中心拱支网壳结构的整体稳定性能进行研究,指出现阶段对桁架拱稳定性分析的基本方法和步骤.更多还原

【Abstract】 This paper presents elastic and elastic-plastic buckling behavior of a truss-arch structure.Firstly,by analyzing elastic buckling loads and corresponding buckling modes of the truss-arch,available failure types of the truss-arches are discussed comprehensively.Secondly,by using the nonlinear finite element software ANSYS,the in-plane ultimate load-carrying capacity of the truss-arch is studied.The stability behavior of truss-arch is investigated from load-displacement curves and main buckling types are found out.Finally,overall stability behavior of an arch-truss supported by latticed shells in Nantong Sports and Exhibition Center is studied.And basic method and procedure for stability analysis of truss-arch are presented.更多还原