耗能梁段与RC框架梁连接节点的滞回性能试验

Hysteretic behavior test of connection joints between RC frame beam and energy dissipation beam segment

为研究耗能梁段与RC框架梁连接节点的抗震性能,进行了5个足尺耗能梁段与RC框架梁连接节点的低周往复加载试验,获得了连接节点的滞回曲线、承载力、变形、延性、刚度退化及耗能等。结果表明:结构胶可增强U型外包钢同RC框架梁之间的整体性,提高节点的承载力和刚度,但后期RC框架梁易出现剪切破坏。随着高强螺杆数量的增加及直径的增大,U型外包钢连接节点的承载力和刚度均呈增大趋势。总体上,U型外包钢连接节点的滞回曲线捏缩,耗能能力一般。为确保U型外包钢连接节点抗震性能的可靠性,高强螺杆应可靠传递水平剪力和弯矩,避免在整个受力过程中高强螺杆剪断失效。

In order to investigate the seismic behavior of joints between energy dissipation beam segment and RC frame beam,the low- cycle loading test of five full- scale specimens of joint between RC frame beam and energy dissipation beam segment was carried out,and the hysteretic curves,bearing capacity,deformation,ductility,stiffness degradation and energy dissipation of the test specimens were obtained. The results reveal that structural glue can enhance the connection integrity between RC frame beam and U- shaped encased steel connection,and increase the bearing capacity and stiffness of connection,but lead to shear failure mode of RC frame beam at last stage easily. With the increase of the quantity and diameter of high- strength bolts,the bearing capacity and stiffness of connection joints exhibit an increasing trend. In general,this connection joints have the pinched hysteretic curves and moderate energy dissipation capacity. To ensure the reliability of seismic behavior of U- shape steel connection joints,the high- strength bolts should transfer lateral shear and moment reliably,and avoid the shear fracture during the loading process.