转角软化桁架模型在RC变梁节点抗剪分析中的应用

摘要

An analytical model for equivalent joint core of frame joint under the combined action of axial load and shear was established, and the shear stress versus shear angle curves of equivalent joint core of 10 tested specimens were calculated using rotating angel softened truss model. The results indicate that the shear behavior of equivalent joint core calculated by rotating angel softened truss model is quite in accordance with test results. Comparing the semi-empirical formulas of joint shear strength suggested by the current codes, the rotating angel softened truss model has more definite mechanical model and can serve for the shear design of frame joint of reinforced concrete structures.%在以往试验研究基础上,建立考虑左、右梁高不等特性的中节点等效核心区在剪、压复合作用下的计算模型,应用转角软化桁架模型对10个钢筋混凝土变梁中节点试件进行受剪分析.研究结果表明:基于转角软化桁架模型计算得到的节点剪应力-剪切变形曲线与试验曲线较吻合；与现行规范给出的半经验计算公式相比,转角软化桁架模型有明确的力学计算模型,可为钢筋混凝土框架节点的抗剪设计提供参考.