保护层剥离行为对CFRP加固锈蚀钢筋混凝土梁性能的影响  

The influence of protective layer debonding on the performance of cfrp-strengthened corroded reinforced concrete beams

作　　者：唐文龙 曹峰 易金[2,3] 钟立恒 夏海龙[3] TANG Wenlong;CAO Feng;YI Jin;ZHONG Liheng;XIA Hailong(CCCC-SHB Seventh Engineering Co.,Ltd.,Nanning 530220,Guangxi,China;Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin University of Technology,Guilin 541004,Guangxi,China;College of Civil Engineering and Architcture,Guilin University of Technology,Guilin 541004,Guangxi,China)

机构地区：[1]中交二公局第七工程有限公司,广西南宁530220 [2]桂林理工大学广西绿色建材与建筑工业化重点实验室,广西桂林541004 [3]桂林理工大学土木工程学院,广西桂林541004

出　　处：《水利水电技术(中英文)》2025年第4期225-234,共10页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(52178194);广西自然科学基金项目(2024GXNSFGA010002);广西绿色建材与建筑工业化重点实验室项目(桂科能22-J-21-15)。

摘　　要：【目的】合理且准确地阐述碳纤维增强基复合材料(CFRP)在加固锈蚀钢筋混凝土受弯构件时的力学行为和破坏机理,对于深入研究并提升CFRP加固技术在增强锈蚀钢筋混凝土结构的力学性能和耐久性方面至关重要。【方法】结合声发射监测技术对不同锈蚀程度的钢筋混凝土梁进行了CFRP加固后的抗弯性能试验研究,通过综合分析挠度、钢筋应变、碳纤维应变以及声发射信号特征等关键指标,揭示了CFRP加固锈蚀钢筋混凝土梁的力学特征。【结果】结果表明:CFRP加固效果与钢筋的锈蚀程度紧密相关,在加固方法确定的情况下,随着钢筋锈蚀率的增加,由于钢筋与混凝土之间的粘结性能退化,导致“拉拱”效应加剧,CFRP的加固效果逐渐降低。【结论】混凝土保护层的剥离与脱落使CFRP与混凝土的“拉拱”效应比钢筋表现更为显著,对试验梁的整体力学性能产生了更大的影响。此外,声发射监测信号特征与力学试验指标相结合,能够更全面地反映试验梁在各个受力阶段的力学响应,为CFRP加固锈蚀钢筋混凝土结构的评估和设计提供了有力的技术支持。[Objective]Reasonably and accurately describing the mechanical behavior and failure mechanism of Carbon Fiber Reinforced Polymer(CFRP)when used to reinforce corroded steel-bar concrete bending members is crucial for in-depth research and improvement of CFRP reinforcement technology in enhancing the mechanical performance and durability of corroded steel-bar concrete structures.[Methods]Acoustic emission monitoring technology was employed to conduct bending performance tests on steel-bar concrete beams with different degrees of corrosion which reinforced by CFRP.By comprehensively analyzing key indicators such as deflection,rebar strain,carbon fiber strain,and characteristics of acoustic emission signals,the mechanical characteristics of CFRP-reinforced corroded steel-bar concrete beams were revealed.[Results]The result showed that the effect of CFRP reinforcement was closely related to the degree of corrosion of the steel-bar.Under a determined reinforcement method,as the corrosion rate of the steel-bar increased,the“tension arch”effect was intensified due to the degradation of the bond performance between the steel-bar and concrete,leading to a gradual decrease in the reinforcement effect of CFRP.[Conclusion]The spalling and detachment of the concrete cover made the“tension arch”effect between CFRP and concrete more significant than that of the steel-bar,which had a greater impact on the overall mechanical performance of the test beams.In addition,combining the characteristics of acoustic emission monitoring signals with mechanical test indicators could more comprehensively reflect the mechanical response of the test beams at various loading stages,providing strong technical support for the evaluation and design of CFRP-reinforced corroded steel-bar concrete structures.

关 键 词：锈蚀钢筋混凝土 碳纤维 声发射 “拉拱”效应 变形 力学性能 

分 类 号：TU375.1[建筑科学—结构工程]