FLEXURAL PERFORMANCE OF FRP/CONCRETE HYBRID BEAMS USING WET-BONDING TECHNOLOGY

摘要

FRP/concrete hybrid structures represent the future of composites for construction. To prevent the localized failure and promote strong composite action, an innovative wet-bonding technology has been developed to establish a uniform chemical bond between the prefabricated FRP composite and the cast-in-place concrete. In this paper, the flexural behaviour of the FRP/concrete hybrid beams using the wet-bonding technology was investigated based on five 4-point bending tests. The FRP composites were designed to incorporate high modulus carbon fiber sheets and high ductility glass fiber sheets as tensile reinforcement, and the high ductility glass fiber sheets as shear reinforcement. The test results shown that, using appropriate wet-bonding technology, the bonding force be- tween the FRP shell and cast-in-place concrete core was sufficient to bear the ultimate load of the beam. With the help of minimum internal reinforcement ratio of about 0. 2 %, the FRP/concrete hybrid beams fabricated using wet-bonding with epoxy resin E3P as bonding agent demonstrated an ultimate load and post-yielding ductility equivalent to that in a RC beam of ρ=1. 5%.