考虑楼板影响的钢框架结构节点域数学模型

Models for panel zones in steel moment frame structures with composite action

为研究混凝土楼板对钢框架结构节点域受力性能的影响,在有限元分析基础上,确定影响节点域性能的楼板有效宽度.根据对弹性和塑性阶段节点域的受力分析,提出了考虑组合效应的节点域数学模型,推导出相应的抗剪刚度和强度计算公式,并与有限元结果进行对比分析.研究结果表明:该数学模型能够很好地模拟考虑楼板影响的节点域的受力性能;在梁端弯矩相同情况下,作用在考虑楼板影响的节点域上的剪力比不考虑楼板影响的情况小.

To research the influence of concrete slab on the behavior of panel zone in steel moment frame structures,the effective width of composite connections was proposed by finite element analysis.Based on analysis within elastic and post-elastic range of the panel zone,a new model,which is particularly suited for modelling steel and composite joints within frame analysis procedures,is proposed,and the formulae calculating the shearing stiffness and ultimate strength of the composite joints are derived.The results demonstrate that the approach provides a more realistic representation of the behavior in comparison with the available models,especially in the case of composite connections.Shear force in panel zone with slab is smaller than that without slab under the same moment loads.