方支管-H型钢主管T型节点轴压性能数值分析

Numerical analysis of axial compression behavior for square hollow section brace-H section chord T-joints

为研究方支管-H型钢主管平面T型节点的轴压性能,利用有限元软件ABAQUS,对方支管-H型钢主管平面T型节点进行模拟计算,以得到破坏模式和极限承载力.试验结果表明,破坏模式为支管根部屈曲破坏,极限承载力为242 kN,模拟结果和试验结果误差10.5%,有限元能够较好地模拟实验节点,工程中应适当增加支管壁厚以避免支管过快发生屈曲破坏.

In order to study the axial compression behavior of square hollow section （SHS） brace-H section chord T-joint , a finite element model simulating the experiment on a SHS brace-H section chord T-joint was generated in order to obtain the failure mode and ultimate capacity using ABAQUS software. The results showed that the failure mode is brace local buckling and the ultimate capacity is 242 kN. The error of ex- periment compare with simulation is 10.5%. The brace was buckling since the square hollow section is a thin-walled component relative to H section chord. The finite element model is quite similar to the experi- mental one, and the wall thickness of brace should be thicken to avoid buckling.