钢框架平端板连接组合节点弯矩-转角关系

Relationship between moment and rotation angle of composite joints of steel frames with flush end-plate connections

端板连接节点是多高层钢框架结构体系中经常采用的梁柱连接形式,当考虑现浇钢筋混凝土楼板的作用并有足够的抗剪连接件时则形成了端板连接组合节点,楼板对组合节点承载力和刚度都有贡献。基于ABAQUS软件建立了考虑楼板组合作用影响的端板连接梁柱组合节点的三维有限元数值分析模型,并分别用有关研究者完成的无楼板钢框架端板节点及考虑楼板作用的组合节点的试验结果对理论模型进行了验证,总体上数值模拟结果和试验结果吻合良好。基于该数值模型进行了平端板连接组合节点力学性能影响因素的参数分析,探讨了楼板、柱腹板加劲肋、楼板配筋率、端板厚度、梁截面高度等参数对组合节点力学性能的影响,在此基础上对欧洲规范建议的弯矩-转角关系模型进行了必要修正,最终提出了可反映楼板作用的平端板连接组合节点弯矩-转角关系实用模型。该模型计算结果与有限元结果吻合良好,可为进一步研究该类节点的设计方法提供参考。

End-plate connection is one of the main types of beam to column connections in multistory or highrise steel structures. The reinforced concrete (RC) slab contributes to the strength and stiffness of the composite connections if the composite effect between steel beam and RC slab is considered and effective shear connectors are mounted. A 3-D finite element (FE) model was developed by using ABAQUS to simulate the behavior of composite joints with flush end-plate connection and RC slab. The FE model was verified by other researchers' experimental results. The FE results match well with the test results in general. Parameteric studies were performed to learn the behavior of the composite joints. The influences of RC slab, stiffening ribs of column web, reinforcing bar ratio of RC slab, thinkness of end-plate and depth of beam on the composite joint performances were considered. A practical model regarding the relationship between moment and rotating angle of the composite joints with flush end-plate connection was proposed to consider the RC slab effect and to modify some parameters of the Eurocode model based on parametric studies. The curves of proposed model agree well with the FE results, and the model is refered to further study the design approach of this type of composite joints.