Abstract
Recently, repairing or strengthening steel members with externally bonded Carbon Fiber Reinforced Polymer (CFRP) plates has been widely reported. In these reports, some criteria for preventing the debonding of the CFRP plates were proposed. In Japan, although CFRP plates have been employed to enhance steel members that are deteriorating from corrosion attack or fatigue cracks or have been applied to upgrade the load-carrying capacity of steel members, there is no clear standard for preventing the debonding of CFRP plates from steel members. In this study, to assist in determining the design criterion for preventing debonding, we derived and solved dierential equations that calculate the stresses in steel members with CFRP plates under concentrated and uniformly-distributed loads. Further, this paper presents the convergent stresses in the adhesive at the ends of the CFRP plates that were strengthening steel members. The convergent stresses at the adhesive ends are sucient to allow CFRP plates to be used under any load conditions.
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