折线形钢箱柱节点受力性能试验研究

Experimental study on load-carrying behavior for joints of zigzag welded box column

对折线形钢箱柱节点进行了1∶3缩尺模型力学性能的试验研究和非线性有限元分析。试验研究包括设计荷载作用下的验证试验和极限承载力试验。试验结果表明:在设计荷载作用下,折线形钢箱柱节点始终处于弹性阶段,极限承载力试验中,折线形钢箱柱节点的受力最不利部位为节点水平段与节点下段交接区域,该部位的内转折点处存在应力集中但未发生明显的局部屈曲现象;分析结果表明:有限元计算结果与试验结果吻合良好,从而验证了理论分析与原型结构设计的正确性;因此,在构造合理和焊缝质量优良的前提下,折线形钢箱柱节点可以应用于承重结构中。

An experimental program and associated FEA were carried out on 1∶3 scale joints models of zigzag welded box columns.The experimental program included the test under the most unfavorable load combination and the ultimate bearing capacity test.The experimental results show that the joint is in the state of elasticity under designed loads.In the ultimate bearing capacity test,the most unfavourable working position of the joint is the zone where the horizontal segment intersected the lower segment,with stress concentration appeared at the inner corner of the zone,however,there is no obvious local buckling.The analysis shows that the experimental results match well with the finite element analysis results,demonstrating that both theoretical analysis and original structure design are reasonable.The study reveals that the joint of zigzag welded box column which has reasonable configuration and excellent weld quality,can be used in load-bearing structures.