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提出了一种新型的钢骨混凝土柱-钢筋混凝土梁的环梁节点,该节点传力途径为:框架梁剪力经环梁扩散传递给节点以下钢骨混凝土柱;框架梁端弯矩首先传递给环梁,环梁依靠整体拉压形成力偶将弯矩传递给钢骨混凝土柱。采用在柱顶施加恒定轴力的同时给框架梁端施加竖向力的加载模式,分别对正交、斜交两种形式的节点进行了单调受弯试验和单调受剪试验。试验结果表明,该类节点可以有效实现“强节点弱构件”的设计目标。同时,给出了新型环梁的配筋验算方法。
A new type of SRC beam-ring girder node is proposed. The way of transmitting force is as follows: the shear of frame beam is transmitted to the SRC column below the node by the shearing of the frame beam; the bending moment of frame beam is firstly transmitted To the ring beam, the ring beam depends on the overall tension and compression to form the force even to the moment transfer to the steel-concrete column. The monotonic bending test and monotonous shear test of two kinds of nodes in orthogonal and skewed modes respectively are carried out by applying a constant axial force on the top of the column and applying a vertical force to the beam ends of the frame. Experimental results show that this type of node can effectively achieve the design goal of “strong node weak component”. At the same time, the method of checking reinforcement of new type of ring beam is given.