钢梁-钢筋混凝土柱梁柱节点的设计模型

DEFORMATION-BASED CAPACITY DESIGN OF RCS BEAM-COLUMN CONNECTIONS

通过分析钢筋混凝土柱-钢梁(RCS)梁柱节点试验和有限元分析结果,对P-M模型进行了修正,提出内混凝土考虑承压变形和剪切变形的节点设计模型。该模型认为RCS节点变形是三维空间变形,应将内混凝土、外混凝土分开,分别按处于平面应变状态来处理,内混凝土变形大于外混凝土变形,除了剪切变形之外,内混凝土还有很大承压变形。基于设计模型和有限元分析结果提出RCS边柱节点名义强度计算公式和设计公式。取内混凝土总变形为2%时节点的抗剪强度为名义强度。这些公式可供我国制定规范所参考。

According to the experimental and numerical results for RC column-to-steel beam（RCS） connections,the P-M model,which can predict the shear strength versus the shear distortion response of RCS connections,is modified and a design model taking account of both the bearing deformation and shear distortion in the inner concrete is presented.The model is based on the fact that the RCS joint deformation is three-dimensional.The inner and outer concrete should be separated and each of them is assumed to be in the state of plane strain,respectively.The deformation of inner concrete is larger than that of outer concrete.Besides a shear distortion,a large bearing deformation exists in the inner concrete.The nominal strength formulae and design equations for exterior RCS joints are obtained based on the modified model and numerical results.The shear strength of the joint at 2.0% total joint deformation is taken as nominal strength.These formulae can be used as a reference for drafting the Code.