摘要
为实现钢框架结构震后快速修复,遵循损伤控制理念,提出一种由狗骨削弱型耗能板通过高强度螺栓连接上、下柱段的韧性钢框架柱脚节点,通过柱翼缘及加劲肋对耗能板提供面外约束,从而限制其屈曲变形,改善抗震性能。基于柱脚节点的工作原理,对2个柱脚节点开展低周循环加载试验研究,并与采用无约束耗能板的对照柱脚节点的滞回曲线、骨架曲线和累积耗能进行比较。试验结果表明:该柱脚节点具有稳定的承载、变形和耗能能力,损伤主要集中于耗能板,即使在层间位移角5%下,上、下柱段依然基本保持弹性;更换损伤的耗能板后,柱脚节点可以恢复原有的滞回性能;当层间位移角达到5%时,设置屈曲约束耗能板的累积耗能相比无约束耗能板的提高了16%。该柱脚节点具有优异的抗震性能,同时可以实现钢结构震后修复。
Following the damage-control concept,a novel resilient steel column base composed of dog-bone weakened fuse plates connected to the upper and lower column segments by high-strength bolts was proposed in order to achieve rapid post-earthquake restoration.The out-of-plane restraint provided by the column flanges and stiffeners could limit buckling of the fuse plates and therefore improve the seismic performance.Cyclic loading tests were conducted on two such column bases based on the working mechanism and the hysteresis curves,skeleton curves,and energy dissipation were compared with the counterpart with unrestrained fuse plates.The results show that the column base has stable load-bearing,deformation and energy dissipation capacities,with the damage concentrated mainly in the fuse plates,while the upper and lower column segments remain basically elastic at inter-story drift angle of 5%.The column base can recover its original mechanical performance after replacing the damaged fuse plates.By restraining the fuse plates,the cumulative energy dissipation could be increased by 16%when the inter-story drift angle reaches 5%.The proposed innovative column base has excellent seismic performance and meanwhile allows for effective post-earthquake repair of steel structures.
作者
胡方鑫
陈鹏
潘建荣
王湛
HU Fangxin;CHEN Peng;PAN Jianrong;WANG Zhan(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Building and Urban Science,South China University of Technology,Guangzhou 510640,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第S01期112-119,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51978279,52278181,52108145)
广东省基础与应用基础研究基金项目(2021A1515010610)
关键词
钢框架
柱脚节点
可更换
屈曲约束板
拟静力试验
抗震性能
steel frame
column base
replaceable
buckling-restrained fuse plate
quasi-static test
seismic behavior
