端板连接剪切型可替换独立耗能梁段的恢复力特性

Restoring force characteristics of end-plate connected replaceable independent shear links

运用有限元软件ABAQUS对8个不同参数的可替换独立耗能梁段进行数值模拟,得到耗能梁段的剪切承载能力、滞回性能、耗能能力、骨架曲线刚度和延性.结果表明:耗能梁段的剪切承载能力比较稳定;滞回曲线饱满、呈梭形,可替换耗能梁段具有良好的耗能能力;试件骨架曲线的形状与单调荷载作用下的荷载-位移曲线形状相似,都经历了弹性段、线性强化段以及承载力下降段;可替换耗能梁段刚度随着梁段长度的增加以及截面尺寸的减小出现了一定程度的退化,加载初期的刚度退化最明显.研究结果为偏心支撑钢框架耗能梁段的分离式设计奠定了基础.

By analyzing the eight replaceable independent link beams with different parameters with the finite element software ABAQUS, the shear bearing capacity, hysteretic behavior, energy dissipation ca- pacity, stiffness, ductility and the skeleton curve of the replaceable independent shear links were ob- tained. The results showed that the shear bearing capacity of the replaceable link beams was relatively sta- ble and the replaceable link beam had strong energy dissipation capacity. The shape of the skeleton curve of the specimens was similar to the shape of the load-displacement curve under monotonic load, they all experienced the elastic stage, strengthening stage and decline of carrying capacity. The stiffness of the re- placeable link beams degenerated to a certain degree with the increase of beam length and the decrease of cross section, the degradation of stiffness was most pronounced in the early stage. This study lays a foun- dation for the research of separate designing the replaceable independent shear links of the eccentrically braced frame.