装配式K型偏心支撑钢框架抗震性能与震后替换

Aseismic performance and post-earthquake replacement of prefabricated K-type eccentrically frame braced steel frame

为研究耗能梁段连接构造和震后替换对装配式偏心支撑钢框架抗震性能的影响,对5个装配式K型偏心支撑钢框架进行拟静力循环加载试验。结果表明:耗能梁段连接构造对装配式偏心支撑钢框架抗震性能影响较大,当耗能梁段端板采用平齐端板连接时,随着耗能梁段连接端板厚度的增加,结构的承载能力、延性和耗能能力均呈上升趋势;当耗能梁段采用外伸式端板连接时,结构的承载能力、耗能能力相较耗能梁段采用平齐端板连接均有较大提升;对耗能梁段采用不同端板形式的两框架进行震后替换耗能梁段发现,替换后框架各项抗震性能指标并无明显下降,说明这两种结构皆具有良好的可替换性,但耗能梁段采用外伸式端板连接的框架替换性能更好。

Here,to study effects of energy dissipation beam segment connection structure and post-earthquake replacement on seismic performance of prefabricated eccentrically frame braced steel frame,5 prefabricated K-type eccentrically frame braced steel frames were tested under quasi-static cyclic loading.The results showed that connection structure of energy dissipation beam segments has larger impact on seismic performance of prefabricated eccentrically frame braced steel frame;when end plates of energy dissipation beam segments adopt flush end plates for connection,the structure’s load-bearing capacity,ductility and energy dissipation capacity increase with increase in connection end plate thickness;when extended end plates are adopted to connect energy dissipation beam segments,the load-bearing capacity and energy dissipation capacity of the structure are greatly improved compared with the situation adopting flush end plates;seismic performance indexes of the frame after adopting different end plate connection forms for post-earthquake replacement of energy dissipation beam segments do not decrease significantly,so the two end plate forms have good replaceability,but frames with energy dissipation beam segments connected using extended end plates have better replacement performance.