FLEXURAL STRENGTHENING OF CONCRETE BEAMS WITH EXTERNALLY BONDED FRP REINFORCEMENT

摘要

A technique for the flexural strengthening of existing reinforced concrete bridge structures is to apply externally bonded reinforcement to the soffits of beams and slabs. This paper describes the influence of various parameters on the flexural behaviour of beams strengthened with externally bonded FRP reinforcement. These parameters include the concrete beam strength, and the modulus and strength of the FRP external reinforcement. Over thirty 2.3m long conventionally reinforced concrete beams were fabricated and externally strengthened with epoxy-bonded unstressed CFRP and GFRP laminates. The experimental results from the test beams compared favourably with predictions from sophisticated finite element models.