Abstract
Hybrid reinforced beams subjected to chloride salt erosion are susceptible to chloride ion infiltration, leading to corrosion of longitudinal reinforcement within the beams and thus impacting their flexural capacity. This study aims to assess the impact of varying reinforcement material area ratio and chloride salt erosion environments on the flexural behavior of hybrid GFRP-steel reinforced concrete beams. This is achieved through bending tests conducted on one reinforced concrete beam and seven concrete beams incorporating hybrid GFRP-steel reinforcement, coupled with finite element analysis. The results demonstrate that the better reinforcement material area ratio (RMAR) for hybrid reinforced beams is 1.36. When compared to the non-eroded beam, beams exposed to chloride salt erosion consistently exhibited a failure mode characterized by steel yield-concrete crushing failure, and the development of cross-sectional strain of the erosion beams aligning with the assumption of a plane section. The more severe erosion conditions lead to increased beam deflection, reduced maximum crack width, and reduced load-bearing capacity. Based on these findings, formula for accurately predicting the upper limits of load-induced crack widths at all levels and the formula for the load carrying capacity are deduced. Moreover, the feasibility of the nonlinear spring finite element method is validated. The results of this study offer significant reference value for the design and practical application of hybrid reinforcement beams.
Published Version
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