可替换式偏心支撑钢框架抗震性能

为了研究耗能梁段屈服类型、柱轴压和震后替换耗能梁段对可替换式偏心支撑钢框架抗震性能的影响，采用拟静力循环加载的方法对4个可替换式偏心支撑钢框架进行试验，并从滞回曲线、刚度退化、延性系数和构件应变等方面分析其抗震性能. 结果表明，耗能梁段屈服类型对可替换式偏心支撑钢框架抗震性能影响较大，随着耗能梁段从剪切型过渡到弯曲型，结构的承载能力、延性和耗能能力均呈下降趋势；随着柱轴压的增加，试件的初始刚度和延性系数逐渐降低；震后替换耗能梁段的模型与原模型相比，仅耗能能力有所下降，其余性能变化不大，说明这种结构具有良好的可替换性. 通过对应变分析发现，直至试验结束，耗能梁以外绝大部分区域仍处于弹性阶段，说明耗能梁段作为第一道抗震防线可以保护其他构件.

Seismic performance of replaceable eccentrically braced steel frame

In order to study the yield type of the link, the axial force of the column and the post-earthquake replacement link on seismic performance of replacement eccentrically braced steel frame, the pseudo-static cyclic loading tests of four replaceable eccentrically braced steel frames were carried out. The hysteretic curves, the stiffness degradation, the ductility coefficient and the strain of specimens were investigated to evaluate the seismic performance. Results show that the yield type of the link is one of the important factors affecting the seismic performance of the replaceable eccentrically braced steel frame, the bearing capacity, the ductility and the energy dissipation capacity of the specimens with shear type is higher than that of bending type. The initial stiffness and the ductility coefficient of the structure decrease with the increase of the axial force of the column. Compared with the original model, only the energy dissipation capacity of the model of replacing the link after the earthquake is decreased, while the other performance did not change much which indicates that the structure has good replaceability. Through the corresponding strain analysis, it is found that until the end of the test, most areas are still in the elastic status except the link, which indicates that the link as the first seismic defense line can protect other members.