桁架结构弹塑性屈曲承载力计算方法

A new method for calculating the elastoplastic buckling strength of simple truss structures

针对桁架结构稳定承载力问题,本文提出了一种弹塑性屈曲承载力计算方法。在考虑荷载分布形式、结构形式、节点连接以及材料非线性的影响下,确定桁架结构的最不利杆件,并基于最不利杆件的弹塑性屈曲承载力计算结构的弹塑性屈曲承载力。应用该方法对单杆桁架模型和简单桁架进行弹塑性屈曲承载力分析,并与有限元软件ABAQUS分析的屈曲承载力进行对比。所估算的屈曲承载力与有限元模拟特征值屈曲分析和riks分析模拟的屈曲承载力较为接近。进而验证了本文所提出的桁架结构弹塑性屈曲承载力计算方法,即通过参考杆件屈曲承载力估算桁架结构屈曲承载力下限值的方法,是可行与可靠的。

In this study,a method for calculating the elastoplastic buckling strength is proposed to solve the stability strength of truss structures.First,considering the influence of load distribution form,structure form,connection between the member and the joint,and material nonlinearity,the most unfavorable member of the truss structure is determined.The elastoplastic buckling strength of the truss structures is calculated on the basis of the elastoplastic buckling strength of the most unfavorable members.Second,the elastoplastic buckling strength is analyzed by the proposed method using the single-member and simple truss structure models and compared with that analyzed by the finite element software ABAQUS.The elasto-plastic buckling strength estimation proposed in this paper are close to that calculated by the finite element method and risk method.And which also verify that the proposed elasto-plastic buckling strength estimation method,namely,the elasto-plastic buckling strength of the structures is calculated based on the elasto-plastic buckling strength of the most unfavorable members,is feasible and reliable.