新型组合楼板与钢梁连接节点受剪性能研究

Research on Shear Performance of A New Type of Joints Between Composite Floors and Steel Beams

为研究装配式交错桁架结构体系中钢梁与组合楼板的可靠连接,提出了一种空心组合楼板与钢梁形成组合扁梁的节点连接形式。对4组8个采用高强螺栓、T形连接件及贯穿钢筋连接的钢-混凝土组合试件进行了推出试验,试验主要分析了贯穿钢筋直径及有无T形连接件对连接节点的破坏模式、荷载-滑移特征和受剪承载力的影响。利用ABAQUS有限元软件对推出试件建立精确的非线性有限元模型来分析内部剪力的传递机制,并对数值分析结果与试验结果进行了对比。研究结果表明:新的节点破坏模式为高强螺栓栓杆在T形连接件与钢梁界面处被剪断,发生脆性破坏;在构件中配置T形连接件后其承载力增加2倍,配置T形连接件可以显著提高构件承载力;增大贯穿钢筋直径可以提高构件抗剪承载能力和抗剪刚度,建议选用直径为20 mm的贯穿钢筋。

To study the reliable connection between the steel beam and the composite floor in the prefabri-cated staggered truss structure system,the paper proposed a joint connection form in which the hollow com-posite floor and the steel beam formed a composite flat beam.Push-out tests were carried out on 4 groups of 8 steel-concrete composite specimens connected by high-strength bolts,T-shaped connectors,and through-bars,the effects of the diameter of rebars and the presence or absence of T-shaped connectors on the failure mode,load-slip characteristics,and shear capacity of the joints were mainly analyzed.ABAQUS finite ele-ment software was used to establish an accurate nonlinear finite element model for the specimens to analyze the transmission mechanism of internal shear force,and the numerical analysis results were compared with the experimental results.The research results showed that the new failure mode of the new type of joints was that the high-strength bolts were sheared at the interface between the T-shaped connector and the steel beam,and brittle failure occurred;the bearing capacity of the component could be significantly improved;the diameter of the through-bar could be increased to improve the shear bearing capacity and shear stiffness of the member.It is recommended to use a through-bar with a diameter of 20 mm.