Experimental Research on the Rehabilitation Effects and Punching Shear Load-Carrying Capacity for the Evaluation Equation of RC Slabs with CFS

Abstract

The authors have conducted a fatigue load test due to a fixed point-loading on the reinforced concrete (RC) slabs strengthened with carbon fiber sheets (CFS) on those bottom sides; subsequently, the reinforcement effects by virtue of their residual strengths after the static load tests were evaluated and then the theoretical equation of the load carrying capacity as to the CFS-reinforced RC slabs has been proposed. As the result, the increasing strength ratios of the non-damaged CFS-reinforced RC slab and the CFS-reinforced RC slabs subjected to the stress hysteresises under the running vibration loads of ±20% and ±30% amplitudes were 1.35, 1.24 and 1.09 times in comparison with the static strength of CFS-unreinforced RC slab, respectively. Furthermore, the theoretical equation of punching shear load carrying capacity of the CFS-reinforced RC slab accumulating the CFS-effective increment to that of the ordinary RC slab has been proposed ; consequently the theoretical value agrees well with the experimental one whether the CFS-reinforced RC slab is non-damaged or not.