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

MIN Xinzhe; TU Yongming

doi:10.3724/j.gyjzG24091902

Volume 55 Issue 2

Feb. 2025

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MIN Xinzhe, TU Yongming. Experimental Research on the Fatigue Damage Characteristics of CFRP Plate-Concrete Bonding Interface[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 254-262. doi: 10.3724/j.gyjzG24091902

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MIN Xinzhe, TU Yongming. Experimental Research on the Fatigue Damage Characteristics of CFRP Plate-Concrete Bonding Interface[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 254-262. doi: 10.3724/j.gyjzG24091902

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

doi: 10.3724/j.gyjzG24091902

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

Received Date: 2024-09-19
Available Online: 2025-04-02

Abstract

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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References

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