TY - GEN
T1 - Stress analysis of unbonded and bonded prestressed CFRP-strengthened steel plates
AU - Hosseini, A.
AU - Ghafoori, E.
AU - Motavalli, M.
AU - Nussbaumer, A.
AU - Zhao, X. L.
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by the Swiss National Science Foundation (Project No: 5211.00892.100.01). The authors would like to thank the technicians of the Structural Engineering Research Laboratory and Mechanical Systems Engineering Laboratory of Empa for their cooperation in performing the experiments. Excellent support from S&P Clever Reinforcement Company AG, Switzerland, for providing the materials of the current study is highly appreciated.
Publisher Copyright:
Copyright © 2016 Department of Civil and Environmental Engineering & Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University.
PY - 2016
Y1 - 2016
N2 - Numerous research studies are available in the literature on strengthening of steel members using carbon fiber reinforced polymer (CFRP) composites. Although it is clear that strengthening using prestressed CFRP plates has several advantages over non-prestressed reinforcements, less attention has been paid in the literature to develop theoretical formulations. Consequently, in this paper, unbonded and bonded prestressed CFRP-strengthened steel plates are analyzed and stresses in CFRP and steel substrate are analytically formulated. Furthermore, the effect of single-side retrofit, which is usually neglected in stress calculations, has been studied. Analytical formulations were then verified by the results of static tests on CFRP-strengthened steel plates under tensile loading. The primary results show that prestressing could considerably reduce the tensile stresses in steel. Consequently, strengthening with prestressed CFRP laminates could be used as an efficient technique for strengthening of steel members, especially those prone to fatigue. However, the available capacity of the prestressed bonded reinforcements before debonding is much less than the developed mechanically anchored, prestressed unbonded reinforcements. Moreover, analytical modeling and experimental results of the current study show that neglecting the eccentricity in single-side CFRP-strengthened steel plates could result in an unsafe stress prediction in steel substrate.
AB - Numerous research studies are available in the literature on strengthening of steel members using carbon fiber reinforced polymer (CFRP) composites. Although it is clear that strengthening using prestressed CFRP plates has several advantages over non-prestressed reinforcements, less attention has been paid in the literature to develop theoretical formulations. Consequently, in this paper, unbonded and bonded prestressed CFRP-strengthened steel plates are analyzed and stresses in CFRP and steel substrate are analytically formulated. Furthermore, the effect of single-side retrofit, which is usually neglected in stress calculations, has been studied. Analytical formulations were then verified by the results of static tests on CFRP-strengthened steel plates under tensile loading. The primary results show that prestressing could considerably reduce the tensile stresses in steel. Consequently, strengthening with prestressed CFRP laminates could be used as an efficient technique for strengthening of steel members, especially those prone to fatigue. However, the available capacity of the prestressed bonded reinforcements before debonding is much less than the developed mechanically anchored, prestressed unbonded reinforcements. Moreover, analytical modeling and experimental results of the current study show that neglecting the eccentricity in single-side CFRP-strengthened steel plates could result in an unsafe stress prediction in steel substrate.
KW - Analytical solution
KW - Prestressed CFRP
KW - Steel member
KW - Strengthening
KW - Unbonded reinforcement
UR - http://www.scopus.com/inward/record.url?scp=85026507419&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85026507419
T3 - Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
SP - 1179
EP - 1186
BT - Proceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
A2 - Dai, J.G.
A2 - Teng, J.G.
PB - Department of Civil and Environmental Engineering and Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University
T2 - 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
Y2 - 14 December 2016 through 16 December 2016
ER -