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International Journal of Polymer Science
Volume 2017, Article ID 1247949, 11 pages
Research Article

Fatigue Crack Propagation Behavior of RC Beams Strengthened with CFRP under High Temperature and High Humidity Environment

1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
2State Key Laboratory of Building Science, South China University of Technology, Guangzhou 510640, China

Correspondence should be addressed to Peiyan Huang; nc.ude.tucs@gnauhyp

Received 13 September 2016; Accepted 21 December 2016; Published 15 January 2017

Academic Editor: Giuseppina Amato

Copyright © 2017 Dongyang Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Numerical and experimental methods were applied to investigate fatigue crack propagation behavior of reinforced concrete (RC) beams strengthened with a new type carbon fiber reinforced polymer (CFRP) named as carbon fiber laminate (CFL) subjected to hot-wet environment. -integral of a central crack in the strengthened beam under three-point bending load was calculated by ABAQUS. In finite element model, simulation of CFL-concrete interface was based on the bilinear cohesive zone model under hot-wet environment and indoor atmosphere. And, then, fatigue crack propagation tests were carried out under high temperature and high humidity (50°C, 95% R · H) environment pretreatment and indoor atmosphere (23°C, 78% R · H) to obtain curves and crack propagation rate, , of the strengthened beams. Paris-Erdogan formula was developed based on the numerical analysis and environmental fatigue tests.