Abstract
This paper presents the numerical analysis of prestressed reinforced concrete (PRC) beams strengthened with near-surface mounted (NSM) carbon fiber reinforced polymers (CFRP). ABAQUS finite element software was used to simulate the existing test beams to investigate the flexural behaviors of PRC beams strengthened with NSM CFRP strips. The finite element model of beams strengthened with NSM CFRP strips was established. The finite element calculation results were compared with the experimental results to verify the accuracy and effectiveness of the model. Based on this model, the influences of concrete strength grade and amount of CFRP strips on the flexural behaviors of directly strengthened beams and the cycle numbers and overload amplitude on the flexural behaviors of damaged strengthened beam were further analyzed, and the load-carrying capacity calculation formula of PRC beam strengthened with NSM CFRP strips was established. The results showed that the simulation results and the theoretical calculation were consistent with the test results. With the increase of concrete strength grade and amount of CFRP strips, the ultimate load of directly strengthened beams increased significantly, with a maximum increase of 21.3% and 23.0%, respectively. When the concrete strength grade exceeded C50, the improvement of the ultimate load was limited. When the overload amplitude was less than 60% of the ultimate load, the cycle numbers (within 500 times) had little effect on the yield load, ultimate load, and deformation. When the overload amplitude was higher than 60% of the ultimate load, the deformation increased, and the ultimate load decreased with the increase of the cycle numbers. The larger the overload amplitude, the smaller the ultimate load, and the larger the deformation under the same cycle numbers.
Highlights
carbon fiber reinforced polymers (CFRP) are widely used in structural reinforcement projects because of its lightweight, high strength, and corrosion resistance. e most common CFRP strengthening method of reinforced concrete beams is to externally bond (EB) CFRP laminates onto the soffit of the beam [1]
Because the parameters of test analysis are limited, the loadcarrying capacity of strengthened beams under specific loading times cannot be analyzed comprehensively. erefore, in this paper, the flexural behaviors of prestressed reinforced concrete (PRC) beams strengthened with near-surface mounted (NSM) CFRP strips are studied using ABAQUS finite element. e model of strengthened beams is established. e correctness of the numerical model is verified by comparing it with the experimental results
Finite element model established in this paper could accurately simulate the flexural behaviors of PRC beams strengthened with NSM CFRP strips
Summary
CFRP are widely used in structural reinforcement projects because of its lightweight, high strength, and corrosion resistance. e most common CFRP strengthening method of reinforced concrete beams is to externally bond (EB) CFRP laminates onto the soffit of the beam [1]. Dias et al. Advances in Materials Science and Engineering [14] conducted an experimental study on the flexural strengthening performance of reinforced concrete beams by using the strengthening technique of NSM CFRP strips and tested one unstrengthened control beam and three strengthened beams with different amounts of CFRP. E test results showed that the NSM CFRP strips were very effective for the flexural reinforcement of reinforced concrete beams, which could effectively improve the cracking, yield, and ultimate load of beams. A large number of theoretical and experimental studies have been carried out on the flexural behavior of concrete beams strengthened with NSM CFRP strips, and some research results have been obtained. The influences of concrete strength grade, amount of CFRP strips, cycle numbers, and overload amplitude on the flexural behaviors of strengthened beams are further analyzed. (4) en the load test is continued until the failure after the curing period. e ultimate load of each strengthened beam is obtained
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