EFFECT OF SHEAR-TO-FLEXURAL STRENGTH RATIO ON DEBONDING FAILURE IN CFRP-STRENGTHENED REINFORCED CONCRETE BEAMS
Debonding of CFRP laminates is the main failure mode in externally CFRP-strengthened reinforced concrete beams. Intermediate crack induced debonding can be classified into two types: flexural crack induced and shear-flexural crack induced interfacial debonding. This paper presents an experimental investigation to study how the debonding strength in FRP-strengthened RC beams, with critical shear-flexural crack induced CFRP debonding failure, would be affected by its shear-to-flexural strength ratio. Based on experimental and analytical results, it is concluded that shear capacity affects the debonding strength of the strengthened beam significantly, and the debonding-to-ultimate flexural strength ratio increases with the increase of shear-to-flexural strength ratio. This indicates that the debonding strength can be improved with the increase of shear capacity in CFRP-strengthened RC beams. As a result, it is necessary to verify the shear capacity of flexural-strengthened RC beam to avoid CFRP laminate debonding prematurely.
Gui-Bing Li
Department of Management Science and Engineering, Shandong Institute of Business and Technology, Yantai 264000, P.R. China Department of Civil Engineering, Zhejiang University, Hangzhou 310027, P.R. China
国际会议
长沙
英文
1188-1194
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）