EXPERIMENTAL INVESTIGATION ON DAMAGE-CONTROL HYBRID FRP-RC GIRDERS WITH WET-BONDING

摘要

A novel type of fiber reinforced polymer reinforced concrete (FRP-RC) hybrid structure is proposed in this paper to exemplify state-of-the-art composite design techniques. The FRP-RC hybrid structure, which is designed under a novel damage-control design approach, is composed of external hybrid FRP shells and a reinforced concrete core. The bonding of interior walls of the hybrid FRP shell and cast concrete is realized through epoxy resins by using a wet bonding technique. The external FRP shell includes carbon FRP with high strength and high elastic modulus as longitudinal reinforcements and glass FRP with high ductility as both longitudinal and shear reinforcements. In addition, the external FRP shell protects the concrete core and steel rebars against corrosion. The results of a series of 4-point bending experiments are presented to confirm the structural performance of FRP-RC girders; these results are evaluated in the context of damage- control design methodology. The investigation reveals that the damage of FRP-RC structures is controllable and that the wet bonding technique is effective.