K型间隙方钢管桁架静力工作性能的有限元分析

为了研究直接焊接K型间隙方钢管平面桁架静力工作性能,对4榀直接焊接K型间隙方钢管桁架进行了非线性有限元分析。采用有限元分析软件ANSYS程序中的4节点板壳单元对桁架进行弹塑性、大挠度有限元分析;不仅跟踪了桁架荷载-位移曲线的全过程,而且分析了桁架节点部分的变形和塑性发展情况;建立了铰接桁架模型、刚接桁架模型、壳单元桁架模型及考虑焊缝的壳单元桁架模型4个桁架模型;比较了设计荷载作用下4个不同桁架模型的腹杆和弦杆的轴向力,以及标准荷载作用下这4个不同桁架模型的整体刚度。

Finite Element Analysis of Static Work Behavior of SHS Truss with Gapped K-joints

In order to investigate the static work behavior of square hollow section(SHS) truss with gapped K-joints,nonlinear finite element analysis of four trusses which directly welded K-joints was carried out.Making use of finite element analysis software ANSYS,in which four nodes shell element was employed,elastic-plastic large deflection finite element analysis of truss was conducted.Not only the upward and downward phases of the load and displacement curve were traced,but also deformation and plastic development situation of joints were studied.The four truss models of pin-jointed link elements,rigid-jointed beam elements,shell elements as well as shell elements which took weld into account were developed.Axial forces of web bars and chord bars of these four truss models bearing designed load were compared.Besides,the whole stiffness of four different truss models bearing standard load was compared.