A study on upgrading procedure of strengthening performance for RC structure by means of submerged FRP plate bonding method

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In this study, in order to improve the bonding performance of submerged Pre-casted Fiber Reinforced Polymer plate (PCa-FRP plate) bonding method, a solution of arranging the shear keys to concrete surface of RC beam was proposed. And then, the static four-point loading tests of RC beams strengthened with submerged PCa-FRP plate bonding method were conducted. From this study, following results were obtained: 1) flexural load-carrying capacity of submerged strengthened RC beam can be improved by arranging shear keys with adequate intervals; 2) when the shear keys setting intervals are comparably small, PCa-FRP plate may be easy to debond from concrete surface because many cracks are occurred at bond layer near shear keys; and the adequate shear keys interval is 60 ~ 90 % of the effective depth of RC beam.