earticle

영어

Reinforced concrete structure has been widely used thanks to its easiness to construct with longer service life, but it produces several problems such as crack, deflection and lowered strength of a structure due to various external and environmental factors like loading and earthquake. Researches are actively being carried out on repairing and reinforcing method to improve these problems. For the strengthening material mainly used at construction sites, steel plate and fiber can be counted in general, and for the fiber case, a composite material like glass fiber, carbon fiber and aramid fiber for reinforcing is commonly used in concrete structures. For the end development method, only the development effect has been verified through experiments without providing an effective development design per FRP strengthening quantity on a tensile surface. Further more, clear understanding on the cause of bond failure is not enough and the problem is that development of an effective development method to control it is not yet carried out up-to-now. Therefore, this study acknowledges the strengthening effect through behaviors of each specimen and test results by performing tests on total 4 reinforced concrete beams with the strengthening quantity and its position as variables in order to evaluate the performance of the Peel-ply method using aramid fiber plate to increase bonding strength with the basic material concrete.