TESTS ON RC T-BEAMS STRENGTHENED IN FLEXURE WITH A GLUED AND BOLTED CFRP LAMINATE

摘要

The use of externally bonded FRP reinforcement for strengthening or rehabilitation purposes is becoming a well documented technique worldwide. Often it appears in the design that the full capacity of the FRP can not be achieved: premature failure due to debonding mechanisms may occur at fairly limited stress levels. Newly developed FRP laminates, with fibres in different directions, are suitable to be used in combination with extra mechanical anchorage (e.g. bolts). Tests on RC T-beams performed at the Magnel Laboratory for Concrete Research demonstrate that the use of bolts in the most critical zones can prevent or postpone premature debonding failure and significantly increase the strengthening factor. Furthermore an appropriate design of the anchorage can improve the "post-peak" behaviour of the beam with high residual strength after debonding of the laminate and with less brittle failure modes.