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可靠的节点连接是屈曲约束支撑混凝土框架结构应用的关键技术之一。利用有限元分析软件ABAQUS对一种用于该结构的节点形式,建立边节点的有限元分析模型。研究在不同受力状态下节点裂缝和变形发展过程,明确节点的极限状态和破坏状态,并系统分析了轴压比、梁配筋率和梁柱线刚度比等对节点承载力和变形性能的影响规律。研究结果表明该节点形式通过适当的设置可以满足“强节点,弱构件”的要求。轴压比对节点的性能影响很小;梁柱线刚度比对节点的弹性和弹塑性性能影响显著;梁配筋率既影响节点的承载力和变形性能,又决定着节点的破坏形式。
Reliable joint connection is one of the key technologies for the application of buckling restraining concrete frame structure. The finite element analysis software ABAQUS is used to establish a finite element analysis model of the edge node for the structure. The process of crack propagation and deformation in different stress states is studied, and the ultimate state and failure state of nodes are defined. The effects of axial compression ratio, beam reinforcement ratio and beam-column stiffness ratio on the joint bearing capacity and deformation performance Affect the law. The results show that the node form can meet the requirements of “strong nodes and weak components ” through appropriate settings. The effect of axial compression ratio on the joint performance is very small. The stiffness ratio of beam and column has a significant influence on the elastic and elastoplastic properties of the joint. The ratio of beam reinforcement affects not only the bearing capacity and deformation performance but also the failure mode of the joint.