Experimental study and analysis of shear strength of RC beams due to reinforcement corrosion
To study the effect of corrosion on the shear bearing capacity of RC beams,10 RC beams were designed for simulation test,the mechanism and the influence of corrosion on the structure were analyzed.The stirrup corrosion was simulated by mechanical cutting,the unbonded longitudinal reinforcement was simulated by wrapping a thin insulated Teflon film,and the corrosive crack across the longitudinal reinforcement was simulated by filling acrylic plate in the tests.The correlation between the influence factor of corrosion and the stirrup cross section loss rate was fitted according to the experimental results.The results show that,wrapping a thin insulated Teflon film and filling an acrylic plate can simulate very well the unbonded reinforcements and the corrosive cracks.The reinforcement corrosion has a significant effect on the shear performance of the RC beams.As the corrosion becomes severe,the shear capacity of the RC beam decreases dramatically.The preditions of the existing formulae are very conservative and discrete,while the proposed formula in this study gets a more accurate and less discrete prediction.
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