결손된 전단부위를 숏크리트로 충전한 철근콘크리트 보의 전단거동에 관한 실험적 연구 = An Experimental Study on the Shear Behavior of RC Beams Repaired by Shotcrete

다국어 초록 (Multilingual Abstract)

This paper concentrates on the most common repair technique in which in the course of applying the repair materials, the cover and steel/concrete bond over shear regions of the damaged RC elements is in-filled by shotcrete prior to the application of the strengthening the repair materials. This research work addresses two major concerns. The first is to examine the effectiveness of in-filled shotcrete in shear regions with different patterns of replacing damaged RC beams. The second is to study the validity of the currently used recommendations for shear design of shotcrete-repaired beams, tight beams were tested to determine their diagonal cracking and ultimate shear capacities. The variables in the test program were the extent of removal of steel/concrete bond; the compressive strength of concrete; the percentage of the shear reinforcement. Two of the beams were unrepaired original beams, Three beams were repaired by removing the cover concrete to 50mm, and the last three were repaired by removing the bottom layer to a depth equal to 100mm. The repaired beams were compared to the original beams with respect to cracking, deflection, ultimate strength, shear deformation, and mode of failure. Test results show that the most significant strength loss occurred in the cases where there was no shear reinforcement. However, inn the case of all specimens with web reinforcement, the reduction in the strength of the repaired beams was not affect in either 50mm or 100mm layer repaired specimens.