This paper discusses the problem of predicting the stiffness, the load capacity and the failure modes of RC members strengthened in bending with bonded steel or C-FRP thin plates. A critical issue of this strengthening technique is that when the plate debonds, the load 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. Debonding occurs when the bond strength is reached locally. In order to properly describe and realistically predict the behavior of the strengthened beams, a displacement-based fiber beam model including bond slip is used. The proposed model is used to confirm and investigate distinct failure modes observed in experimental investigations.
Analysis of R/C Beams Strengthened with FRP Plates
APRILE, Alessandra;
2004
Abstract
This paper discusses the problem of predicting the stiffness, the load capacity and the failure modes of RC members strengthened in bending with bonded steel or C-FRP thin plates. A critical issue of this strengthening technique is that when the plate debonds, the load 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. Debonding occurs when the bond strength is reached locally. In order to properly describe and realistically predict the behavior of the strengthened beams, a displacement-based fiber beam model including bond slip is used. The proposed model is used to confirm and investigate distinct failure modes observed in experimental investigations.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
