X型插板焊接方管节点轴压承载力的有限元分析

Finite element analysis of axial ultimate capacity of X-type branch plate-to-square hollow section connection

以X型插板焊接方管受压节点的试验数据为基础,运用ABAQUS软件对节点进行了模拟分析,校验了节点轴压极限承力、应变分布和破坏模式等方面的非线性有限元建模方法.研究结果表明:在承受轴压作用时,节点焊缝附近的插板局部屈曲,平面外失稳而倾斜;插板板厚相对于方管的较小,工程中应采取增加插板厚度或在插板两边设置加劲肋等加强措施;节点的塑性变形能力较差,使得破坏呈脆性.

A finite element model simulating the experiment on X-type branch plate-to-square hollow section connection was generated by ABAQUS and validated by comparing the axial ultimate capacity,strain distribution and failure mode with experimental results. The result showed that under the effect of axial pressure,plate local buckled near the weld,the plate tilted because of out-of-plane instability; it should be avoided that due to the fact the thickness of plate was relatively smaller than chord joints should be strengthened by increasing plate thickness or installing rib stiffener on bath sides of plate in engineering;X-type branch plate-to-square hollow section connections had weak plastic deformation capacity from plasticity.