X型方钢管节点平面内受弯性能研究

Study on in-plane bending property of SHS X-joints

为考察X型方钢管节点在平面内弯矩作用下的静力性能,通过ABAQUS进行建模及非线性有限元计算,结合验证性试验,对节点的破坏模式、应变强度发展过程、极限承载力进行研究,并讨论轴力和平面内弯矩联合作用对节点极限承载力的影响.结果表明:节点在平面内弯矩作用下,发生弦杆受拉侧鼓凸,受压侧凹陷,腹杆受拉侧焊缝被拉开;节点弦杆最先进入塑性,最终由于塑性变形过大而导致试件破坏;试件极限承载力随着β值的增大而增大;在轴力和平面内弯矩联合作用下,节点的受弯极限承载下降.

In order to investigate the static behavior of SHS（ square hollow section）X-joints under in-plane bending, geometry model and non-linear finite element analysis were carried out using ABAQUS software. Combining with verifying experiment, the failure mode, deformation process and ultimate capacity of SHS X- joints were investigated, the effect of joint action between axial force and bending mement on the ultimate bearing capacity was also discussed. The results showed that, under in-plane bending, tension side of chord protruded, compression side sunk, and the welds in tension side of brace failed. Node chord entered a plas- tic phrase and finally the sample failed due to large plastic deformation. The ultimate capacity increased re- markably as ]~ value increasd. Under the joint action between axial force and bending mement, the ultimate bearing capacity decreased.