钢管混凝土扁柱-钢梁节点抗震性能有限元分析

为避免钢框架结构中梁柱节点凸出墙体,文章提出一种钢管混凝土扁柱与钢梁节点,采用 ABAQUS 有限元模拟软件建立 4 个不同连接位置的钢管混凝土扁柱-钢梁节点的有限元模型,分析节点在低周往复荷载下的破坏模式和抗震性能;结果表明,所提出的节点构造可以实现梁柱刚性连接,所有节点均发生梁铰破坏,抗震性能和耗能能力良好。进一步研究轴压比、竖向隔板厚度和连接构造对节点抗震性能的影响规律,结果表明:随着轴压比的提高,柱端峰值承载力随之下降;减小柱内竖向内隔板的厚度会导致柱端承载力的降低;将盖板连接改为竖向加劲肋连接后,能有效缓解节点处柱壁的应力集中现象。

To avoid the projection of beam-column joints from the wall in the steel frame structure, this paper proposes a kind of joint between concrete-filled steel tubular flat column and H-beam. Finite element model of the joints with four different connection positions was established in ABAQUS software to analyze the failure mode and seismic performance of the joints under low-cyclic reversed loads. Finite element analysis results show that the proposed joints can achieve a rigid beam-column connection. All joints are subject to beam-hinged damage with good seismic performance and energy dissipation capacity. On this basis, the effects of axial compression ratio, thickness of vertical internal plate and beam-end configuration on the seismic performance of the joints were further investigated. The results show that the force applied on the column-end decreases with the increase of axial pressure ratio and the decrease of the thickness of vertical internal plate. The stress concentration effect at the joint can be effectively relieved by replacing the cover plate connection with the vertical stiffeners reinforced connection.