earticle

영어

The flexural behavior of reinforced concrete beams strengthened with FRP-steel composite plate is presented. In this method, FRP-steel composite plate, reinforced with a combination of fibers(carbon or glass) and steel plate, are bonded to the concrete substrate and fastened with anchor bolts. The experimental work included flexural testing of 2.4m-long concrete beams with bonded and anchored composite plate. The strengthened RC beams were designed to fail in a ductile manner. The thin steel plate in FRP-steel composite plate makes usage of the anchoring system possible, which could delay or prevent the premature debonding failure. Two reference beams and 21 strengthened beams with CSP(Carbon fiber-steel composite plate) and 12 strengthened beams with GSP(Glass fiber-steel composite plate) were tested.
The structural behaviors of strengthened beams are compared with codes in terms of yield load and ultimate load, flexural stiffness. 33 beams were tested experimentally to evaluate the strength enhancement provided by the composite plate.
In the test results presented in this paper, the strengthened beams showed increases in yield and ultimate loads of up to 29~70% and 33~115%, respectively over an unstrengthened beam. All strengthened beams failed, as intended, in a ductile manner with the ultimate failure mode due to fiber tension failure in composite plate at large deflection with the composite plate still firmly attached. According to the results, it is shown that beams strengthened with composite plate are structurally efficient.