主管局部加固焊接方钢管T型节点滞回性能研究  

Hysteretic Performance of Square Tubular T-joint with Local Reinforcement on Chord

作　　者：刘艳[1,2] 王慧玲[2] 邓芃[1,2] 秦菲[2] 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590

出　　处：《建筑科学》2016年第3期50-55,共6页Building Science

基　　金：山东省高等学校科技计划项目J13LG05

摘　　要：β(支管与主管外径比)较大的焊接方钢管T型节点因主管连接焊缝韧性差和质量缺陷等因素,可能因焊缝开裂而导致节点丧失承载力。本文提出在主管节点区将角钢沿主管管壁焊接在主管侧壁和上表面上,通过角钢将支管轴力传至主管的侧壁,这不仅避免主管连接焊缝开裂所导致的脆性破坏,也可充分发挥主管节点区板件的塑性耗能作用。基于两支角钢加固T型节点和普通T型节点的拟静力试验研究,研究了主管局部加固节点的破坏过程、破坏模式,发现加固节点屈曲发生的范围大、屈曲幅度大,节点承载力下降也比较平缓;另外,加固节点的滞回曲线饱满,滞回环包围面积明显大于未加固节点,加固节点具有良好的抗震能力。Tubular T-joint with bigger β（ the diameter ratio of brace and chord） will lose bearing capacity caused by weld crack in plate of chord,which led by its poor toughness,quality defects and other factors. It is suggested that large angle steel welded in the joint zone of chord can deliver the axial force of brace to the sidewall of chord,which can not only avoid the brittle failure caused by connecting weld crack,also can develop the plastic energy dissipation capacity of plates of chord in the joint zone. Based on the quasi static tests on two angle steel reinforced T-joints with different length and one ordinary T-joint,the failure process and failure mode are studied. It is concluded that： the buckling range of reinforced joint is larger and plates of chord buckle more obviously,and the bearing capacity decreases more gently; in addition,the reinforced joint has better seismic capacity,the hysteretic loop of reinforced joint is fuller,and the enclosed area of reinforced joint is greater than that of ordinary joint.

关 键 词：焊接方钢管 T型节点 焊缝 加固 滞回性能 

分 类 号：TU392.3[建筑科学—结构工程]