[1]高 婧,韩泽鸿,宋怀辉,等.开槽外贴CFRP布-混凝土界面的黏结性能[J].长安大学学报(自然科学版),2025,45(2):85-95.[doi:10.19721/j.cnki.1671-8879.2025.02.008]
　GAO Jing,HAN Ze-hong,SONG Huai-hui,et al.Bond behavior of CFRP sheet-concrete interface using externally bonded reinforcement on groove[J].Journal of Chang’an University (Natural Science Edition),2025,45(2):85-95.[doi:10.19721/j.cnki.1671-8879.2025.02.008]
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开槽外贴CFRP布-混凝土界面的黏结性能()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年2期
页码:
85-95
栏目:
桥梁与隧道工程
出版日期:
2025-03-31

文章信息/Info

Title:
Bond behavior of CFRP sheet-concrete interface using externally bonded reinforcement on groove
文章编号:
1671-8879(2025)02-0085-11
作者:
高 婧1; 韩泽鸿1; 宋怀辉1; TERRASI Giovanni2
(1. 厦门大学 建筑与土木工程学院,福建 厦门 361005; 2. 瑞士联邦材料科学与技术实验室(EMPA),苏黎世 迪本多夫 8600)
Author(s):
GAO Jing1;  HAN Ze-hong1;  SONG Huai-hui1;  TERRASI Giovanni2
(1. School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. Swiss Federal Laboratories for Materials Science and Technology(EMPA), Dübendorf 8600, Zürich, Switzerland)
关键词:
桥梁工程;  复合材料;  黏结性能;  开槽外贴加固;  CFRP;  开槽尺寸
Keywords:
bridge engineering;  composite material;  bond behavior;  externally bonded reinforcement on groove;  CFRP;  groove size
分类号:
U444
DOI:
10.19721/j.cnki.1671-8879.2025.02.008
文献标志码:
A
摘要:
为研究混凝土开槽后在凹槽区域外贴碳纤维增强聚合物(CFRP)材料的界面黏结性能,以开槽宽度和深度、混凝土强度等级为主要参数,进行16组开槽外贴CFRP布混凝土试件单剪试验,设置4组未开槽混凝土表面外贴CFRP布试件为对照组; 通过分析试验荷载-位移曲线、应力分布特点及试件破坏现象,探究试件的极限荷载、黏结强度、最大剪应力、最大滑移量等参数的变化趋势,讨论开槽尺寸和加固方法对试件破坏模式的影响,分析试件的破坏原因及机理; 基于试验数据拟合结果建立混凝土开槽外贴CFRP布试件的黏结-滑移模型及最大剪应力计算模型,并将最大剪应力预测结果与文献数据进行对比。研究结果表明:相比于未开槽的加固方法,开槽外贴CFRP布的加固方法能够有效提高混凝土试件黏结界面的极限荷载,试件的破坏模式主要表现为黏结破坏、CFRP布断裂破坏和复合破坏; 采用开槽外贴加固(EBROG)方法的试件在凹槽处黏结界面的最大剪应力和峰值滑移随凹槽尺寸的增大而提高,且存在最佳凹槽宽度和深度的组合; 提出的最大剪应力计算模型的预测结果与现有文献试验结果的误差在16%之内,该模型可用于预测开槽区域最大剪应力。
Abstract:
To study the interfacial bond behavior of carbon fiber reinforced polymer(CFRP)material bonded on the groove region after the concrete grooving, a single shear test was conducted on 16 groups of concrete specimens reinforced by CFRP sheets externally boned on groove with main parameters, including the groove width, depth and concrete strength grade. In parallel, 4 sets of concrete specimens with CFRP sheets externally bonded on concrete surface were designated as control groups. By analyzing the load-displacement curves, stress distribution characteristics and failure phenomenon of specimens during the test, the changing trends of parameters such as the ultimate load, bond strength, maximum shear stress and maximum slip of specimens were explored, the influences of groove size and reinforcement method on the failure mode of specimens were discussed, and the failure causes and mechanisms of specimens were analyzed. Based on the fitting results from the test data, the bond-slip model and the maximum shear stress calculation model of concrete specimens reinforced with CFRP sheets externally bonded on groove were developed, and the prediction results of maximum shear stress were compared with results in literatures. The research results show that in comparison with the reinforcement method without groove, the reinforcement method of CFRP sheets externally bonded on groove can effectively augment the ultimate load of the concrete specimen's bonding interface. The failure modes of specimens mainly present as bonding failure, CFRP sheets fracture failure, and composite failure. As the groove size increases, the maximum shear stresses and peak slips of specimens reinforced by externally bonded reinforcement on groove(EBROG)within the grooved region experience a significant increase, and there exists an optimal combination of groove width and depth. The deviation between the prediction results of the proposed calculation model for the maximum shear stress and the test results in relevant literatures is within 16%. Therefore, this model can be applied to predict the maximum shear stress in the groove region.7 tabs, 9 figs, 41 refs.

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备注/Memo

备注/Memo:
收稿日期:2024-09-20
基金项目:国家自然科学基金项目(U2005216); 福建省自然科学基金项目(2020J01010)
作者简介:高 婧(1979-),陕西延安人,女,教授,博士研究生导师,E-mail:gaojing@xmu.edu.cn。
更新日期/Last Update: 2025-04-01