Axial compression performance of high-temperature-exposed concrete-filled steel tubular columns repaired with carbon fiber reinforced polymer

被引：0
作者：
Ma, Kaize [1 ,2 ]
Wang, Qixian [1 ]
Lin, Guirui [1 ]
Xing, Guohua [1 ]
机构：
[1] Changan Univ, Sch Civil Engn, Xian 710000, Peoples R China
[2] Changan Univ, Key Lab Transport Bridge Detect Reinforcement Tech, Xian 710000, Peoples R China
来源：
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH | 2024年 / 213卷
基金：
中国国家自然科学基金;
关键词：
Axial compression; High temperatures; Concrete -filled steel tube; Carbon fiber reinforced polymer; Bearing capacity; BEHAVIOR; TUBE;
D O I：
10.1016/j.jcsr.2023.108400
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Axial compression tests were conducted on high-temperature-exposed round concrete-filled steel tube (CFST) short columns repaired with carbon fiber reinforced polymer (CFRP) to test the influence of temperature, CFRPwrapped layers and concrete strength on compressive performance. The experimental data were plotted as load-displacement and load-hoop strain curves, and the variation laws of the curves were analyzed. The load-displacement curves contain elastic, elastoplastic, and plastic strengthening phases. A finite element model of a high-temperature-exposed CFST column repaired with CFRP was established to analyze the stress changes in the CFRP, steel tube, and concrete. CFRP improves the bearing capacity, stiffness and ductility of CFST columns that were damaged by high temperatures. As the number of CFRP layers increased, the bearing capacity of the repaired columns improved, and deformation was delayed. Taking into account the damage of temperature and the restraint effect of CFRP, an equation was developed to evaluate the axial compression bearing capacity of high-temperature-exposed CFST columns repaired with CFRP.
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页数：15
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