A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Debonding failures of RC beams strengthened with near surface mounted CFRP strips
This paper presents the results of a series of tests conducted on reinforced concrete (RC) beams strengthened in flexure with near surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips. As the main focus of the research is on debonding failure mechanisms, the only test variable investigated was the embedment length of the NSM strip and the NSM strip was extensively strain-gauged to monitor its bond behavior. Load-deflection curves, failure modes, strain distributions in the CFRP strip, and local bond stresses at the CFRP-epoxy interface from the tests are all examined in detail and compared with the predictions of a simple analytical model where appropriate. Of the four embedment lengths investigated, all but the shortest one led to a notable increase in the loadcarrying capacity and, to a lesser extent, in the postcracking stiffness of the beam. Debonding was found to be the primary failure mode in all cases except for the beam with the longest embedment length. Also reported in this paper are results from preliminary bond tests used to characterize the local bond-slip behavior of the NSM system. Apart from gaining a better understanding of debonding failures in RC beams with NSM FRP strips, the test results reported in the paper should be useful for future verification of numerical and analytical models.
Debonding failures of RC beams strengthened with near surface mounted CFRP strips
This paper presents the results of a series of tests conducted on reinforced concrete (RC) beams strengthened in flexure with near surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips. As the main focus of the research is on debonding failure mechanisms, the only test variable investigated was the embedment length of the NSM strip and the NSM strip was extensively strain-gauged to monitor its bond behavior. Load-deflection curves, failure modes, strain distributions in the CFRP strip, and local bond stresses at the CFRP-epoxy interface from the tests are all examined in detail and compared with the predictions of a simple analytical model where appropriate. Of the four embedment lengths investigated, all but the shortest one led to a notable increase in the loadcarrying capacity and, to a lesser extent, in the postcracking stiffness of the beam. Debonding was found to be the primary failure mode in all cases except for the beam with the longest embedment length. Also reported in this paper are results from preliminary bond tests used to characterize the local bond-slip behavior of the NSM system. Apart from gaining a better understanding of debonding failures in RC beams with NSM FRP strips, the test results reported in the paper should be useful for future verification of numerical and analytical models.
Debonding failures of RC beams strengthened with near surface mounted CFRP strips
Teng, J.G. (author) / Lorenzis, L. De (author) / Wang, Bo (author) / Li, Rong (author) / Wong, T.N. (author) / Lam, Lik (author)
Journal of Composites for Construction ; 10 ; 92-105
2006
14 Seiten, 16 Bilder, 2 Tabellen, 23 Quellen
Article (Journal)
English
Debonding Failures of RC Beams Strengthened with Near Surface Mounted CFRP Strips
| British Library Online Contents | 2006
Debonding Failures of RC Beams Strengthened with Near Surface Mounted CFRP Strips
| Online Contents | 2006
Flexural Behavior of Concrete Beams Strengthened with Near-Surface-Mounted CFRP Strips
| Online Contents | 2007