Carbon Fiber Sheets Rc Beam Shear Reinforcement

The rehabilitation of reinforced concrete structures with CFRP laminates is a new reinforcement technique. In this paper, shear capacity of existing RC T-section beams using CFRP composites is discussed. Based on the experiments of five models of RC T-section beams, the ultimate shear capacity of RC T-section beams strengthened with different number of plies, paste formats and initial loads is evaluated. From the experiments, the number and width of fracture are obviously decreased, and pasting CFRP laminates play important role in improving RC construction durability; with anchoring, premature is prevented and the ultimate shear capacity is increased; taking properly anchoring measure, the ultimate shear capacity of RC T-section beams of initial loads is higher than that of no initial loads; under non-anchoring case, because the rehabilitation of RC T-section beams with CFRP laminates are destroyed suddenly, the reinforcement effect maybe decrease. According to the experimental result, the nonlinear finite element software which offers contact analysis, concrete mass element and the birth and death capabilities is used in the whole procedures of analysis and new numerical analyzing method of shear capacity of existing RC T-section beams using CFRP composites is included. In theory research based on truss theory, the effective length of the CFRP sheet and ultimate capacity of paste layer is introduced, then the calculation procedure of the ultimate shear capacity of RC T-section beams strengthened with CFRP laminates is put forward, so did the reinforcement design method of normal service phase. In this paper, analytic methods of paste effect of CFRP laminates and several sort of anchor measurement are introduced.This paper has set a foundation for bridge strengthening with CFRP laminates and numerical analysis in future and provides reference for design and examination in bridge strengthening practice.