环口板加固T型方钢管节点滞回性能的试验研究

为了评价加固后空心钢管结构中焊接管节点的抗震性能,实验研究了环口板加固T型方钢管节点的滞回性能.对2个环口板加固T型方钢管节点和2个对应的未加固节点试件进行了轴向反复荷载作用下的拟静力滞回性能试验.试验测试结果表明:采用环口板加固的T型节点,可以将破坏发生的部位由未加固节点的主支管焊趾处转移到加固节点的环口板与主管表面焊缝处;环口板加固后的节点滞回曲线更加饱满,具有更好的抗震性能;加固后T节点的延性系数比未加固节点的延性系数明显增加,两组加固后的T节点分别提高了:受压阶段34%、100%;受拉阶段33%、145%. 

Experimental Study on Hysteretic Behavior of Square Tubular T-Joints Reinforced with Collar Plate

To assess the anti-seismic behavior of reinforced welded tubular joints with circular hollow section, the hysteretic performance of square tubular T-joints with collar plate reinforcement was studied experimentally. Hysteretic tests were carried out on 2 square tubular T-joints with collar plate reinforcement and on 2 corresponding un-reinforced specimens under quasi-static cyclic loading. The experimental results show that the failure position is transformed from the weld toe along the brace/chord intersection of the un-reinforced specimens to the weld connection between the collar plate and the chord surface of the T-joints with collar plate reinforcement. The hysteretic loops of the reinforced T-joints are much plumper and show a better anti-seismic behavior. The ductility ratio of the reinforced T-joints is improved significantly compared to that of the un-reinforced ones. The values of the ductility ratio are increased by 34% in compression stage and 33% in tension stage for one group of specimens, and increased by 100%in compression stage and 145% in tension stage for another group of specimens.