徐杰^1,2, 尹仲昊¹, 韩庆华^1,2, 熊春宝¹
AuthorsHTML:徐杰^1,2, 尹仲昊¹, 韩庆华^1,2, 熊春宝¹
AuthorsListE:Xu Jie^1,2, Yin Zhonghao¹, Han Qinghua^1,2, Xiong Chunbao¹
AuthorsHTMLE:Xu Jie^1,2, Yin Zhonghao¹, Han Qinghua^1,2, Xiong Chunbao¹
Unit:1. 天津大学建筑工程学院，天津 300072；2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072
Unit_EngLish:1．School of Civil Engineering, Tianjin University, Tianjin 300072, China
2．Key Laboratory of Coast Civil Structure Safety of Ministry of Education(Tianjin University), Tianjin 300072, China
Abstract_Chinese:使用ABAQUS软件建立数值模型分析高温下CFRP加固梁的性能．考虑了CFRP-混凝土接触面的黏结-滑移效应, 并将数值分析结果与试验结果对比, 验证了模型的有效性．利用验证后的模型进行了大量数值分析, 考虑了端部约束、荷载比、防火层厚度、黏结长度、受火条件等对试件耐火性能的影响．结果表明, 设置端部约束可以有效提高试件的耐火极限, 其中边缘约束和全长约束分别可以提高试件的耐火极限约40% 和80% ; 试件的耐火极限随荷载比的增大而减小, 随防火层厚度的增大而增大．以此为基础, 提出了CFRP加固梁的耐火极限的回归预测模型, 可以为工程设计提供参考．
Abstract_English:A finite element model was developed by ABAQUS to analyze the property of CFRP(carbon fiber reinforced polymer)-strengthened RC beams under fire. On the CFRP-concrete surface，the bond-slip behavior was simulated. The model was verified by comparing the numerical results with the test results. The influence of anchorage system，load ratio，thickness of fire insulation，bond length，and fire conditions were considered. The results show that the fire resistance of CFRP beams can be improved when it is anchored. The fire resistance of beams with edge anchorage and length anchorage systems can be improved by about 40% and 80% ，respectively. It can be found that the fire resistance of CFRP beams decreases with the increase of load ratio，and increases with the increase of the thickness of fire insulation. However，a regression forecasting model is proposed to evaluate the fire resistance of CFRP-strengthened RC beams，which can provide a reference for engineering design.
Keyword_Chinese:耐火极限; CFRP; 加固; 有限元模型
Keywords_English:fire resistance; carbon fiber reinforced polymer(CFRP); strengthening; finite element model

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