Experimental Investigation of Taper-Ended FRP Strips in FRP-Strengthened RC Beams
Leung, Christopher K.Y.
|Source||4th International Conference on Advanced Composite Materials in Bridges and Structures, Calgary, Canada , 20-23 July 2004, Paper # ACM-203,|
|Summary||Amongst various methods developed for strengthening and rehabilitation of reinforced concrete (RC) beam structures, external bonding of fiber reinforced plastic (FRP) strips to the beam has been widely accepted as an efficient and convenient method. The ultimate flexural strength and stiffness of strengthened RC beams can be improved significantly, although the FRP strip causes some reduction in ductility of the beam. The high ultimate loading capacity is often impaired by premature failure modes in bending, such as concrete cover separation. In this paper, the structural performance is studied of RC beams bonded with FRP strips with tapered ends whose thickness changed gradually at the cut-off point. Four points bending experiments of RC beams indicate that the FRP strips with tapered ends improved both the loading capacity and the ductility of the beam. The asymmetric double cantilever beam (ADCB) test suggests that the crack propagation was more stable for samples with tapers than without, as confirmed by the larger maximum displacement before complete delamination.|
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