Unified Approach for Evaluation of Shear Strength and Ultimate Deformation of Concrete Members Reinforced with Various Materials

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The summary of conclusions obtained by experimental and numerical analyses in this study is as follows :・The equation to predict the fracturing strength of Carbon Continuous Fiber Flexible Reinforcement (C-CFFR) at bent portion and the model to predict the transferred tensile force by C-CFFR at bent portion were proposed. Three dimensional finite element analyses, in which the proposed strength equation and the force transfer model for C-CFFR were introduced, could predict the mechanical properties of C-CFFR observed in the experiment.・It was observed that the ultimate deformation of concrete columns with Polyacetal Continuous Fiber Flexible Reinforcement (P-CFFR) as tie reinforcement was greater than that of columns with steel tie reinforcement whose volume ratio is the same. This is because P-CFFR did not fracture even at ultimate deformation and because P-CFFR can be arranged inside the core concrete. The prediction formulae for P-CFFR strains were proposed based on the experimental results.・The unified model for bond stress-slip relationship at the interface between continuous fiber sheet and concrete was proposed for finite element analysis of concrete members reinforced with continuous fiber sheet. Based on the finite element analysis of reinforced concrete prism with continuous fiber sheet subjected to uniaxial tension, it was found that the concrete tension stiffness is greater than the case without continuous fiber sheet.・In order to obtain the precise prediction of the shear tension strength of reinforced concrete members, which is necessary for finite element analysis to predict shear and ultimate deformation of concrete members reinforced with various materials, it is necessary to model precisely the force transfer along the major shear crack.