A SHEAR STRENGTH MODEL FOR REINFORCED CONCRETE BEAMS WITH U-WRAPPED FRCM COMPOSITES BASED ON THE COMPRESSION CHORD CAPACITY MODEL

This paper presents a new procedure to determine the different shear strength contributions of reinforced concrete (RC) beams strengthened with U-wrapped externally bonded (EB) fiber-reinforced cementitious matrix (FRCM) composite. A main shear crack, named the critical shear crack (CSC), is assumed. The shear strength contributions are related to the CSC width evolution. The relationship between concrete contribution and CSC width is a hyperbolic function with a horizontal asymptote based on the compression chord capacity model (CCCM). Using a Mörsch truss model, the procedure accounts for the presence of internal steel stirrups and EB FRCM that is modelled considering its bond behavior and tensile strength. The procedure allows for predicting the total shear strength and the different contributions, as shown by comparison between the analytical and experimental results of a beam taken from the literature.Paper 21