扁钢管柱-H型钢梁单边螺栓节点受力性能的参数化分析

Parametric Analysisof Mechanical Behavior of Unilateral Bolt Nodes of Flat Steel Pipe Column-H-shaped Steel Beam

对柱壁加强型无内加劲肋扁钢管柱-H型钢梁单边螺栓连接节点的构造开展参数化分析,研究不同梁柱线刚度比、不同端板厚度对节点受力性能及破坏模式的影响。研究表明:不同梁柱线刚度比的节点破坏模式差别较大,当梁柱线刚度比较小时,节点的失效模式为梁端屈曲,随着梁柱线刚度比的增加,失效模式逐渐转换为端板的屈曲;随着梁柱线刚度比的增加,节点的初始刚度、屈服时对应的承载力以及极限承载力均有所增大;随着端板厚度的增加,节点的抗弯性能逐渐改善,极限承载力和初始转动刚度均有所提升,但提升的幅度逐渐减小。

Parametric analysis is carried out on the construction of unilateral bolt nodes of column-wall reinforced flat steel column-H-shaped steel beam without internal stiffening ribs to study the effects of different beam-column linear stiffness ratios and different end-plate thicknesses on the mechanical behavior and damage modes of the nodes.The study shows that the nodes with different beam-column linear stiffness ratios have different damage modes,when the beam-column linear stffness ratio is small,the failure mode of the node is beam end buckling,and with the increase of the beam-column linear stiffness ratio,the failure mode gradually changes to end-plate buckling;with the increase of the beam-column linear stffness ratio,the initial stiffness,the corresponding bearing capacity at yielding and the ultimate bearing capacity of the node increase;with the increase of the end plate thickness,the flexural properties of the nodes gradually improve,and the ultimate bearing capacity and initial rotational stifness are increased,but the magnitude of the increase gradually decreases.