Abstract
The application of reinforced concrete (RC) beam with near-surface mounted (NSM) pre-stressed carbon fiber reinforced polymer (CFRP) plates has been increasingly widespread in civil engineering. However, debonding failure occurs easily in the early loading stage because of the prestress change at the end of CFRP plate. Therefore, it is important to find reliable, convenient and economical technical means to closely monitor the secure bonding between CFRP and concrete. In this paper, an active sensing approach for generating and sensing stress wave by embedded smart aggregates (SAs) is proposed, which provides a guarantee for the secure connection between CFRP and concrete. Two specimens with different non-pre-stressed bond lengths were fabricated in the laboratory. Six SAs were installed at different positions of the structure to monitor the degree of debonding damage during the loading process. The experiments showed that the optimal length of non-pre-stressed CFRP bond section (300 mm) can significantly improve the load characteristics and enhance the service performance of the structure. The theoretical analysis of wavelet packet shows that increasing the length of non-pre-stressed CFRP bond section can slow down the occurrence and propagation of debonding cracks. The debonding crack in the tension end region is earlier than that in the bond end region. The research results reflect that the developed approach can monitor the damage process caused by debonding cracks and provide early warning for the initial damage and the debonding failure.
Highlights
The recent decade has seen the increasing applications of composite materials in civil engineering [1] and carbon fiber reinforced polymer (CFRP) has emerged as a novel alternative to conventional reinforcement in concrete structures because of its good fatigue endurance, light weight, high tensile strength and high corrosion resistance [2]
Concrete beam with near-surface mounted pre-stressed CFRP plates using embedded we explore the research of the active sensing based debonding reinforced concrete smart aggregates
The photos of the failed beam 1 and beam 2 are shown in Figures 8 and 9
Summary
The recent decade has seen the increasing applications of composite materials in civil engineering [1] and carbon fiber reinforced polymer (CFRP) has emerged as a novel alternative to conventional reinforcement in concrete structures because of its good fatigue endurance, light weight, high tensile strength and high corrosion resistance [2]. There are many studies on the debonding damage of CFRP-strengthened reinforced concrete structure but very few studies on RC structure with NSM pre-stressed CFRP plates have been reported. This paper conducts an experimental research on the debonding damage of the RC beams with NSM pre-stressed CFRP plates. To the best knowledge the authors, debonding monitoring of RC beammonitoring with NSM pre-stressed this paper, we explore theofresearch of the active sensing based debonding of reinforced plates using piezoceramic transducer enabled active sensing has not been reported. Concrete beam with near-surface mounted pre-stressed CFRP plates using embedded we explore the research of the active sensing based debonding reinforced concrete smart aggregates. Different lengths of the non-pre-stressed CFRP bonded section were used as specimens embedded with SAs for monitoring crack development and interface debonding damage. The feasibility and superiority the approach were verified comparing with the deflection change and strain data of the beams
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