耗能梁段与带楼板RC框架梁连接节点的滞回性能研究

通过对5个足尺耗能梁段与带楼板RC框架梁连接节点的低周往复加载试验,研究了此类节点的传力机理、破坏模式等,分析了连接节点的滞回性能、承载力、变形及延性、刚度退化及耗能等性能,并通过ABAQUS有限元程序对试验试件的滞回性能进行模拟。研究结果表明：U型外包钢连接节点构造简单、传力可靠。考虑楼板作用可显著提高耗能梁段与RC梁连接节点的承载力及后期变形能力。耗能梁段端板同RC梁顶面之间的分离导致滞回曲线中部捏缩,滞回性能劣化,耗能能力一般。

HYSTERETIC BEHAVIOR OF THE CONNECTION BETWEEN RC FRAME BEAM WITH FLOOR AND ENERGY DISSIPATION LINK

According to the cyclic tests of a total of five full-scale connections between a RC Frame beam with floor and an energy dissipation link, the force transferring mechanism and failure modes of test specimens were systemically studied, and the hysteretic behavior, lateral strength, deformability, ductility, stiffness, and energy dissipation were analyzed. The hysteretic curves of test specimens were simulated through ABAQUS. The results show that the connection via U-shape steel is simple and reliable. The action of floor can increase the lateral strength and post deformability. The separation between the end plate of an energy dissipation link and the top interface of a RC beam leads to the pinching phenomenon of hysteretic curves and poor energy dissipation.