摘要
为研究有效修复严重震损钢筋混凝土短柱的加固方法,并了解震损钢筋混凝土短柱加固后的抗震性能恢复程度,对5个已进行低周往复水平加载试验且严重损坏的钢筋混凝土短柱用CFRP进行加固,并对其加固后的抗震性能进行试验研究.试验通过控制CFRP加固层数与轴压比来探究震损钢筋混凝土短柱用CFRP加固后的力学性能、破坏机理和破坏变形特征.通过观测试验现象,分析实测获得的F-Δ滞回曲线和骨架曲线,分析CFRP加固层数及轴压比对震损钢筋混凝土短柱加固后的承载力、延性、刚度退化及强度退化的影响,并与震损前短柱的对应参数进行了对比.研究结果证明:使用CFRP加固后的震损钢筋混凝土短柱能有效恢复其部分抗震性能,具有较好的延性与耗能能力;震损钢筋混凝土短柱用CFRP加固后可避免脆性破坏.试验研究证明,CFRP加固修复严重震损钢筋混凝土短柱是可行的,研究成果可供实际加固工程参考.
In order to develop an effective strengthening method for the severely seismic damaged reinforced concrete short columns,an experimental programme on5RC short columns strengthened by CFRP was carried out.Firstly,the RC short columns were damaged by the low cyclic load,and then covered by CFRP layers.Based on the testing results,the mechanical performance,failure mechanism and deformation characteristics of the damaged reinforced concrete short columns with CFRP were studied.In particular,the influence of CFRP layers and the axial compression ratio on the bearing capacity,ductility,stiffness and strength degradation of the strengthened RC short columns were investigated.Moreover,the experimental results were compared with the corresponding response of the undamaged RC short columns.It is shown that the seismic performance of the damaged RC columns is restored effectively with good ductility and seismic energy dissipation capacity due to the application of the CFRP.Therefore,the experimental research in this paper illustrates that the strengthen method using CFRP layers for the severely seismic damaged RC short columns is effective and feasible.
作者
陈俊
胡铮
霍静思
李中均
韩鹏
贺鑫
CHEN Jun;HU Zheng;HUO Jingsi;LI Zhongjun;HAN Peng;HE Xin(College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105;College of Civil Engineering,Huaqiao University, Xiamen 361021 China)
出处
《湘潭大学自然科学学报》
北大核心
2017年第4期36-40,共5页
Natural Science Journal of Xiangtan University
基金
国家自然科学基金项目(51678256)
关键词
CFRP
加固
震损
钢筋混凝土短柱
CFRP
strengthening
seismic damage
reinforced concrete short column
作者简介
通信作者:陈俊(1973-),男,湖南常德人,博士,副教授.Email:chenjun6963@126.com
