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采用试验实测的方法,研究不同支管与主管宽度比(β)方钢管焊接T型节点的静力承载机理和破坏形态,并对节点的变形特点、应变分布、荷载-位移曲线进行分析.结果表明:方钢管焊接节点在支管轴向压力作用下的延性较好,试件在破坏前有充分的塑性发展;β=0.4时试件发生主管表面屈服破坏,β=0.8时试件发生表面屈服与侧壁屈曲破坏,β=1.0时试件发生主管弯曲屈服破坏;节点的轴向承载力和初始刚度随着β的增大有显著提高,β=1.0和β=0.8试件比β=0.4试件的承载力分别提高156%和310%,初始刚度则分别提高68.6%和94%;主管两端固定的约束条件对β≤0.8试件的承载机理及破坏形态影响较小,但引起β=1.0试件在节点区域破坏之前发生主管破坏.
The static load-bearing mechanism and failure mode of welded T-joints with different branch-to-width ratio (β) square steel tubes were studied by means of experimental measurements, and the deformation characteristics, strain distribution and load-displacement curves of the joints were analyzed. : The ductility of the square steel pipe welded joint under the axial pressure of the branch pipe is good, and the specimen has sufficient plasticity development before the failure. When β = 0.4, the surface of the specimen under test has yield yielding damage, and when β = 0.8, The buckling of the sidewall is destroyed, and the bending yield failure of the specimen occurs when β = 1.0. The axial bearing capacity and initial stiffness of the joint increase significantly with the increase of β. The ratio of β = 1.0 and β = 0.8 is better than β = 0.4 The bearing capacity increased by 156% and 310%, respectively, while the initial stiffness increased by 68.6% and 94% respectively. The constrained conditions at both ends of the tube had little effect on the bearing mechanism and failure mode of β≤0.8 specimens, 1.0 The test case ruined before the destruction of the node area.