Shear Strengthening RC T-beams Using CFRP Laminates and Anchors

摘要

Several tests were conducted to evaluate the shear performance of beams strengthened externally with carbon fiber reinforced polymer (CFRP) laminates and CFRP anchors. Results are presented for five tests conducted on 24-in.(610-mm) deep reinforced concrete T-beams constructed and tested at Phil M. Ferguson Structural Engineering Laboratory at the University of Texas at Austin. Monotonically increasing load was applied to the reinforced concrete members at a shear span-to-depth ratio of three (a/d = 3) until failure. Overall, a 40-45% increase in shear strength was observed when anchored CFRP laminates were installed on the RC members. In all cases, CFRP anchors prevented a premature de-bonding failure in the CFRP laminates, thus increasing the useable capacity of the CFRP laminates. Theoretical calculations predicting the shear strength of the retrofitted concrete members were carried out and compared with the measured strengths of the members.