직접전단 시험을 통한 분리타설된 강섬유 보강 콘크리트의 전단마찰강도 분석

초록

When precast concrete elements and cast-in-place concrete are formed separately, they create shear friction at their interface. Ensuring structural integrity is vital, and this involves placing shear friction reinforcement at this interface. Steel fibers are recognized for enhancing shear strength by leveraging the dowel action of shear friction reinforcements, and shear friction capacity can be improved by using steel fibers locally. In this study, 12 push-off tests were conducted to assess how steel fiber reinforced concrete (SFRC) contributes to shear friction strength in direct shear. The experimental findings were also compared with the predicted values from current code provisions. These experiments revealed that the crack width at maximum shear friction strength increased as the volume of steel fibers increased, and the contribution of concrete also increased with higher steel fiber volume. Notably, Eurocode 2 yielded higher contributions compared to AASHTO LRFD. Eurocode 2, which takes into account concrete's tensile strength, provided the most accurate results. Therefore, future studies should consider the influence of concrete when designing for shear friction strength.

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