大悬挑钢箱梁与折线形钢箱柱连接节点试验研究

Experimental study on joints between cantilever steel beam and meandering steel column with box section

为研究大悬挑钢箱梁与折线形钢箱柱连接节点在不同工况组合下的受力性能,对其进行了1∶3的缩尺试验研究和有限元数值分析。试验借助改进型几何可变框式试验架,实现了设计要求的2种荷载工况,并分析了节点在各种工况组合下的受力性能和变形情况。运用有限元软件对节点进行了弹性分析,得到了节点的应力分布与变形情况。研究结果表明:试验结果与有限元分析结果吻合良好,验证了理论分析的正确性;节点在设计荷载作用下始终处于弹性工作状态,其受力最不利位置位于左梁与折线柱的翼缘相交部位。

Experimental study on the joints between cantilever beams and meandering columns with box section had been carried out.The structural behavior of the joints under various loading conditions was evaluated by both 1∶3 scale experiment and FEM analysis.By utilizing variable geometry frame testing jig,two load cases complying with the design requirement were successfully applied to the joints to investigate its structural behavior and deformation.During field testing,the strains on the surface of the joints and displacement of key positions were obtained.Elastic analysis was carried out with FEM package ANSYS,which obtained the stress distribution and deformation.FEM results agree well with experimental results.The joints are in the state of elasticity under designed loads and the most unfavourable working position is the flanges at the intersection of the left beam and meandering steel column.