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Evaluation Systems of Shear Capacity of Reinforced Concrete Members Retrofitted with Carbon Fiber Reinforced Polymer Sheets in Consideration of Bond-Peeling Characteristics

This paper presents an evaluation method of contribution of continuous fiber sheet to shear capacity of RC members. Different from mild steel, CF sheet is completely elastic up to breaking point without any yielding phenomena. CF sheet works effectively in shear strengthening of concrete members when it is glued on concrete. To evaluate shear contribution of CF sheet rationally, it is necessary to consider bonding and peeling-off behavior of CF sheet. In this paper, we formulate a constitutive model for the interfacial zone between CF sheet and concrete according to the uniaxial test results. Based on this computational model, we propose the evaluation system for shear capacity on RC member retrofitted with CF sheets. The applicability of the proposed methods is verified with test results of RC beams.