The structural behaviour of continuous RC beams externally strengthened with Fiber Reinforced Polymers (FRP) sheets is analysed in the paper. Tests results, up to failure, of beams strengthened with different arrangements of external CFRP sheets are described. A theoretical non-linear model derived from a cracking analysis, founded on slip and bond stresses, is proposed. The model, developed by using an analytical form of the local bond-slip law, is adopted to draw the moment curvature diagram of beams taking into account both the tension stiffening effects and the premature failure conditions such as plate end debonding, intermediate crack debonding. The structural behaviour of beams is defined by a non linear procedure founded on the moment-curvature approach. Comparisons between theoretical and experimental results allows to demonstrate that the application of the FRP sheets on continuous beams can increase the ultimate capacity of structural elements allowing, at the same time, the moment redistribution. Obtained results are presented and discussed.
Moment Redistribution in Reinforced Concrete Continuous Beams Strengthened with Externally Bonded FRP (Fiber Reinforced Polymers) Sheets
AIELLO, Maria Antonietta;
2007-01-01
Abstract
The structural behaviour of continuous RC beams externally strengthened with Fiber Reinforced Polymers (FRP) sheets is analysed in the paper. Tests results, up to failure, of beams strengthened with different arrangements of external CFRP sheets are described. A theoretical non-linear model derived from a cracking analysis, founded on slip and bond stresses, is proposed. The model, developed by using an analytical form of the local bond-slip law, is adopted to draw the moment curvature diagram of beams taking into account both the tension stiffening effects and the premature failure conditions such as plate end debonding, intermediate crack debonding. The structural behaviour of beams is defined by a non linear procedure founded on the moment-curvature approach. Comparisons between theoretical and experimental results allows to demonstrate that the application of the FRP sheets on continuous beams can increase the ultimate capacity of structural elements allowing, at the same time, the moment redistribution. Obtained results are presented and discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
