This paper discusses the problem of predicting the stiffness, the loading capacity and the failure modes of RC members strengthened in bending with bonded steel or C-FRP plates. A definitely week critical issue of this strengthening technique is that when the plate debonds, e failure that follows if the plate detachment occurs: in this case, the loading capacity suddenly drops and the failure mode is typically brittle. Due to both the concrete cracking diffusion and the yielding of the steel rebars, a significant amplification of the bond stresses takes place at the beam-plate interface. then Delamination occurs when the bond strength is locally reached. In order to properly describe and realistically predict the behavior of the strengthened beams, a displacement-based fiber beam element is used. Bond slip between the beam and the plate is included by assuming separate displacement fields in the beam and in the strengthening plate. The proposed model is used to confirm and explain distinct failure modes observed in experimental investigations.
Role of Bond in RC Beams Strengthened with Steel and FRP Plates
APRILE, Alessandra;
2001
Abstract
This paper discusses the problem of predicting the stiffness, the loading capacity and the failure modes of RC members strengthened in bending with bonded steel or C-FRP plates. A definitely week critical issue of this strengthening technique is that when the plate debonds, e failure that follows if the plate detachment occurs: in this case, the loading capacity suddenly drops and the failure mode is typically brittle. Due to both the concrete cracking diffusion and the yielding of the steel rebars, a significant amplification of the bond stresses takes place at the beam-plate interface. then Delamination occurs when the bond strength is locally reached. In order to properly describe and realistically predict the behavior of the strengthened beams, a displacement-based fiber beam element is used. Bond slip between the beam and the plate is included by assuming separate displacement fields in the beam and in the strengthening plate. The proposed model is used to confirm and explain distinct failure modes observed in experimental investigations.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
