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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。
Through the low-frequency reciprocating loading tests of five full-scale energy-dissipating beam segments and connecting nodes with RC frame beam with floor, the transmission mechanism and failure mode of such nodes are studied. The hysteretic behavior and bearing capacity , Deformation and ductility, stiffness degradation and energy dissipation. The hysteretic behavior of test specimens was simulated by ABAQUS finite element program. The results show that the U-type steel-encased steel connecting node has the advantages of simple structure and reliable force transmission. Considering the effect of floor, the bearing capacity and post-deformation capacity of the connection between energy dissipation beam and RC beam can be significantly improved. The separation of the end plates of the energy-consuming beam sections from the top surfaces of the RC beams results in pinch-out in the middle of the hysteresis curve, deteriorating the hysteresis characteristics, and the energy dissipation capacity is generally high.