带Z字形悬臂梁段拼接的装配式钢框架节点抗震性能分析

为了解决传统结构装配化程度较低的问题，提出一种适用于装配式钢结构的带Z字形悬臂梁段拼接的梁柱节点，在对6个节点进行低周往复试验的基础上，对其进行了拟静力和静力有限元分析。获得了梁端和拼接区的弯矩转角曲线以及节点的破坏模式，并和试验结果进行了对比。得到了接触面摩擦力、孔壁挤压力以及螺栓拉力的变化规律，分析了螺栓数目、螺孔直径、节点加劲肋形式和框架梁形式对节点抗震性能的影响。通过对拼接区加载过程中各个状态的受力分析，构建了拼接区的弯矩转角关系模型。研究结果表明：减少翼缘高强螺栓数目在不显著降低节点承载能力的前提下提高了节点延性和塑性转动能力；翼缘和腹板螺孔开大孔和节点使用三角形垂直加劲肋对节点抗震性能影响很小；拼接区的上下翼缘板件之间滑移并不是同时开始的；加载过程中大部分螺栓的拉力都会有一定程度的损失。

Analysis of Seismic Behavior of Prefabricated Steel Frame Joints With Z-shaped Cantilever Beam Splicing

In order to solve the problem that assembly degree of traditional structure is not high, a prefabricated steel frame joint with Z-shaped cantilever beam splicing was presented. Based on the experimental results of six specimens, the static and quasi-static finite element analysis was carried out. The moment-rotation curves of both the beam end and the splice, and the failure modes of the joints were obtained, and the results were compared with experimental results. The change rules of the friction between contact surfaces, the extrusion force between bolt shanks and holes, and the bolt tension force were obtained. The effects of bolt number, bolt hole diameter, types of stiffeners and types of framework beams on the seismic behavior of the joints were analyzed. The moment-rotation relationship model of the splice was constructed through force analysis of the states of loading process. The results show that reducing the number of flange high-strength bolts can improve ductility performance and plastic rotation capacity of joints without reducing much of the carrying capacity of joints. The oversized bolt holes were used instead of standard bolt holes and the triangular vertical stiffeners were used instead of internal diaphragms have little impact on seismic behavior of the joint. The slippage between the flanges did not occur at the same time. Most bolts had a certain amount of tension loss during the loading process.