CFRP板-混凝土黏结界面疲劳损伤特性试验研究

闵信哲; 涂永明

doi:10.3724/j.gyjzG24091902

CFRP板-混凝土黏结界面疲劳损伤特性试验研究

doi: 10.3724/j.gyjzG24091902

闵信哲¹,
涂永明²

1. 南京工程学院建筑工程学院, 南京 211167;
2. 东南大学土木工程学院, 南京 211189

基金项目:

南京工程学院引进人才科研启动基金项目(YKJ202122)。

国家自然科学基金青年基金项目(52408181)

江苏省基础研究计划自然科学基金青年基金项目(BK20230703)

江苏省高等学校基础科学(自然科学)研究面上项目(23KJB560010)

详细信息

作者简介:
闵信哲,博士,讲师,主要从事碳纤维复合材料加固技术研究。电子信箱:1564989993@qq.com

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- 文章访问数: 24
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出版历程
- 收稿日期: 2024-09-19
- 网络出版日期: 2025-04-02

Experimental Research on the Fatigue Damage Characteristics of CFRP Plate-Concrete Bonding Interface

MIN Xinzhe¹,
TU Yongming²

1. School of Civil Engineering and Architecture, Nanjing Institute of Technology, Nanjing 211167, China;
2. School of Civil Engineering, Southeast University, Nanjing 211189, China

摘要

摘要: 当采用外贴碳纤维复合材料(CFRP)进行加固的混凝土结构承受疲劳荷载时,损伤会在CFRP板与混凝土的黏结界面层中不断累积,并在宏观上表现为界面层的性能衰减。通过面内剪切试验对CFRP板与混凝土的黏结界面开展了疲劳性能试验研究,详细观测了CFRP板与混凝土基体的相对滑移变化,进而分析了黏结界面的刚度退化行为和界面层的能量耗散过程。发现这些界面性能指标的衰减均主要集中于试件疲劳寿命的约前10%,并在随后的加载过程中趋于稳定。黏结界面层的耗能能力在界面未产生疲劳损伤累积时最强,并会随着疲劳加载的不断进行而快速减弱并趋于稳定。研究发现,疲劳荷载作用下CFRP板-混凝土黏结界面的刚度衰减速率D_s与黏结界面的应力条件S在双对数坐标系下展现出很强的线性关系,并提出了界面的刚度衰减速率计算式。
- 碳纤维复合材料 /
- 混凝土 /
- 黏结界面 /
- 疲劳损伤 /
- 特性试验
Abstract: When concrete structures reinforced with externally bonded carbon fiber reinforced polymer (CFRP) are subjected to fatigue loads, damage accumulates continuously on the bonding interface layer between the CFRP plate and concrete, and manifests macroscopically as performance degradation of the interface layer. This study conducted fatigue performance tests on the bonding interface between CFRP plates and concrete through in-plane shear tests. The relative slip changes between CFRP plates and concrete matrix were observed in detail, and the stiffness degradation behavior of the bonding interface and the energy dissipation process of the interface layer were analyzed. It was found that the attenuation of these interface performance indicators was mainly concentrated in the first 10% of the fatigue life of the specimens, and tended to stabilize during the subsequent loading process. The energy dissipation capacity of the bonding interface layer also rapidly weakened and tended to stabilize with the continuous fatigue loading. This study found that the stiffness attenuation rate D_s of the CFRP plate concrete bonding interface under fatigue loading exhibited a strong linear relation with the stress condition S of the bonding interface in a double logarithmic coordinate system, and a formula for calculating the stiffness attenuation rate of the interface was proposed.
- carbon fiber reinforced plastics /
- concrete /
- bonding interface /
- fatigue damage /
- characteristic test

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参考文献(26)

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