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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。
β (branch to main diameter ratio) larger welded square steel pipe T-joints due to the main connection of the weld toughness and quality defects and other factors, may lead to weld cracking caused by node loss of capacity. This paper proposes that the angle steel be welded along the main pipe wall to the main pipe sidewall and the upper surface in the main node area and the branch pipe axial force to the main pipe sidewall through the angle steel not only avoids the brittle fracture caused by the cracking of the main pipe connecting weld but also Can take full advantage of the plastic sheeting node energy consumption role. Based on the quasi-static tests of two T-joints strengthened with angle steel and ordinary T-joints, the failure process and failure modes of the locally reinforced joints are investigated. It is found that the buckling of the strengthened joints is large, the buckling amplitude is large, and the bearing capacity of the joints is decreased In addition, the hysteretic curve of the reinforced joints is full, the area enclosed by the hysteretic loops is obviously larger than that of the un-strengthened joints, and the reinforced joints have good seismic capacity.