人工塑性铰连接的装配式钢混组合节点非线性静力分析

针对装配式框架节点损伤模式不可控、震后修复困难等问题，提出一种基于人工塑性铰连接的新型装配式钢混组合框架节点形式，其具有构造简单、承载耗能、易装配等特点。为进一步明确该新型节点的受力性能，利用ABAQUS建立节点的非线性有限元模型，以轴压比、翼缘连接板厚度、抗剪耗能杆直径为参数变量，研究不同参数对节点破坏模式、受力机理及弯矩-转角曲线的影响规律，并对节点刚性进行评估。结果表明，该新型节点的破坏模式为梁端受弯破坏，人工塑性铰对节点内力分配与传递起关键作用；随着轴压比的增大，节点承载力和延性系数呈现出先增大后降低的变化趋势，翼缘连接板厚度对节点承载力和延性均有较大影响，抗剪耗能杆直径对节点承载力的影响较小，但对节点延性变形影响较大；该新型节点属于铰接连接和完全强度连接。

Nonlinear static analysis of prefabricated steel-concrete composite joints based on artificial plastic hinge connection

To solve the problems of uncontrolled damage to prefabricated frame joints and the difficulty of post-earthquake repair, a new type of prefabricated steel-concrete composite frame joint based on an artificial plastic hinge connection is proposed. which has the characteristics of simple structure, good performance of bearing capacity and energy dissipation, easy assembly, and so on. To further clarify the mechanical performance of the new joint, the nonlinear finite element model of the joint was established through ABAQUS. Taking the axial compression ratio, flange connecting plate thickness, and diameter of the shear damper as parameter variables, the effects of different parameters on the failure mode, stress mechanism, and moment rotation curve of the joint were studied, and the stiffness of the joint was also evaluated. The results showed that the failure mode of the new joint was a flexural failure at the beam end, and the artificial plastic hinge plays a key role in the internal force distribution and transmission of the joint. With the increase in axial compression ratio, the bearing capacity, and ductility coefficient of the joint showed a trend of first increasing and then decreasing. The flange connecting plate thickness had a great influence on the bearing capacity and ductility. The diameter of the shear energy dissipation rod had little influence on the bearing capacity but had a great influence on the ductility deformation of the joint. The new joint belongs to the hinge connection and full-strength connection.