摘要:
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.
Abstract:
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 Xjoints 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 plastic phrase and finally the sample failed due to large plastic deformation. The ultimate capacity increased remarkably as β value increasd. Under the joint action between axial force and bending mement, the ultimate bearing capacity decreased.
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