SHEAR STRENGTH ANALYSIS OF CONCRETE COLUMN RETROFITTED WITH CFRP SHEET BASED ON STRUT-ARCH MODEL

The experimental investigation of the shear strength of concrete column retrofitted with wrapped CFRP sheet has shown that the CFRP strips behave like stirrups in reinforced concrete members. With no yielding up to its fracture strength of CFRP, the stress of CFRP at the maximum shear loading is found to be the key parameters in determining shear strength of the columns. The strut-arch model is used to study the stress of CFRP at ultimate shear limit state, and a formula is presented. Good agreement is reached between the theoretical predictions and available experimental results.