Fatigue Performance Analysis of Damaged Steel Beams Strengthened with Prestressed Unbonded CFRP Plates
Publication: Journal of Bridge Engineering
Volume 23, Issue 7
Abstract
A study was experimentally and numerically conducted to investigate the fatigue performance of notched steel beams strengthened with prestressed unbonded carbon-fiber-reinforced polymer (CFRP) plates. The experimental study included several large-scale edge-notched steel beams that were strengthened by unbonded CFRP plate with different prestress levels and then tested under cyclic fatigue load. The experimental results indicated that the proposed anchorage and prestressing system is feasible and reliable, and the prestress effect is significant not only for life extension but also in the stiffness decay reduction of the specimens. The highest prestressing level leads to over eightfold increase in the fatigue life of specimens. Furthermore, an analytical model was proposed to determine the effects of prestress level on the fatigue life of reinforced specimens based on a modified Paris’ law. Relative to the experimental results, the predicted results from the analytical model are satisfactory. Moreover, the regression analysis of the experimental results determined that the recommended values of parameter n and C in the modified Paris’ law were 3.0 and 2.72×10−12.
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Acknowledgments
The authors acknowledge the financial support of a grant from the National Science Foundation of China (51208430).
References
Abaqus [Computer software]. SIMULIA, Providence, RI.
ASTM. (2011). “Standard test method for measurement of fatigue crack growth rates.” ASTM E647-11, West Conshohocken, PA.
Bassetti, A. (2001). “Lamelles Precontraintes en Fibres Carbone pour le Renforcement de Ponts Rivetes Endommaees par Fatigue [Fatigue behavior of riveted bridge strengthened with CFRP laminates].” Ph.D. thesis no. 2440, Swiss Federal Institute of Technology, EPFL, Lausanne, Switzerland, https://infoscience.epfl.ch//record/32916 (In French).
Colombi, P., Bassetti, A., and Nussbaumer, A. (2003). “Delamination effects on cracked steel members reinforced by prestressed composite patch.” Theor. Appl. Fract. Mech., 39(1), 61–71.
Colombi, P., and Fava, G. (2016). “Fatigue crack growth in steel beams strengthened by CFRP strips.” Theor. Appl. Fract. Mech., 85(B), 173–182.
Ghafoori, E., and Motavalli, M. (2015a). “Innovative CFRP-prestressing system for strengthening metallic structures.” J. Compos. Constr., 04015006.
Ghafoori, E., and Motavalli, M. (2015b). “Lateral-torsional buckling of steel I-beams retrofitted by bonded and un-bonded CFRP laminates with different pre-stress levels: Experimental and numerical study.” Constr. Build. Mater., 76, 194–206.
Ghafoori, E., and Motavalli, M. (2015c). “Normal, high and ultra-high modulus carbon fiber-reinforced polymer laminates for bonded and un-bonded strengthening of steel beams.” Mater. Des., 67, 232–243.
Ghafoori, E., Motavalli, M., Botsis, J., Herwig, A., and Galli, M. (2012). “Fatigue strengthening of damaged metallic beams using prestressed unbonded and bonded CFRP plates.” Int. J. Fatigue, 44, 303–315.
Ghafoori, E., Motavalli, M., Nussbaumer, A., Herwig, A., Prinz, G. S., and Fontana, M. (2015a). “Design criterion for fatigue strengthening of riveted beams in a 120-year-old railway metallic bridge using pre-stressed CFRP plates.” Composites Part B, 68, 1–13.
Ghafoori, E., Motavalli, M., Nussbaumer, A., Herwig, A., Prinz, G. S., and Fontana, M. (2015b). “Determination of minimum CFRP pre-stress levels for fatigue crack prevention in retrofitted metallic beams.” Eng, Struct., 84, 29–41.
Hosseini, A., Ghafoori, E., Motavalli, M., Nussbaumer, A., and Zhao, X.-L. (2017). “Mode I fatigue crack arrest in tensile steel members using prestressed CFRP plates.” Compos. Struct., 178, 119–134.
Jones, S. C., and Civjan, S. A. (2003). “Application of fiber reinforced polymer overlays to extend steel fatigue life.” J. Compos. Constr., 331–338.
Kamruzzaman, M., Jumaat, M. Z., Sulong, N. H. R., and Islam, A. B. M. S. (2014). “A review on strengthening steel beams using FRP under fatigue.” Sci. World J., 2014, 702537.
Karbhari, V. M. (2014). Rehabilitation of metallic civil infrastructure using fiber reinforced polymer (FRP) composites, Woodhead Publishing, Cambridge, U.K.
Kianmofrad, F., Ghafoori, E., Elyasi, M. M., Motavalli, M., and Rahimian, M. (2017). “Strengthening of metallic beams with different types of pre-stressed un-bonded retrofit systems.” Compos. Struct., 159, 81–95.
Kim, Y. J., and Harries, K. A. (2011). “Fatigue behavior of damaged steel beams repaired with CFRP strips.” Eng. Struct., 33(5), 1491–1502.
Mertz, D. R., Gillespie, J. W., Jr., Chajes, M. J., and Sabol, S. A. (2002). “The rehabilitation of steel bridge girders using advanced composite materials.” Final Report for NCHRP-IDEA Project 51,” Transportation Research Board, Washington, DC.
Mohee, F. M., and Al-Mayah, A. (2016). “Development of an innovative prestressing CFRP plate anchor: Numerical modeling and parametric study.” Compos. Struct., 177, 1–12.
Täljsten, B., Hansen, C. S., and Schmidt, J. W. (2009). “Strengthening of old metallic structures in fatigue with prestressed and non-prestressed CFRP laminates.” Constr. Build. Mater., 23(4), 1665–1677.
Tavakkolizadeh, M., and Saadatmanesh, H. (2003). “Fatigue strength of steel girders strengthened with carbon fiber reinforced polymer patch.” J. Struct. Eng., 186–196.
Teng, J. G., Yu, T., and Fernando, D. (2012). “Strengthening of steel structures with fiber-reinforced polymer composites.” J. Constr. Steel Res., 78, 131–143.
Wu, G., Wang, H.-T., Wu, Z.-S., Liu, H.-Y., and Ren, Y. (2012). “Experimental study on the fatigue behavior of steel beams strengthened with different fiber-reinforced composite plates.” J. Compos. Constr., 127–137.
Ye, H., König, C., Ummenhofer, T., Qiang, S., and Plum, R. (2010). “Fatigue performance of tension steel plates strengthened with prestressed CFRP laminates.” J. Compos. Constr., 609–615.
Zhang, X., Liu, G., and Ma, J. (2016). “Status and prospect of technical development for bridges in China.” China Sci. Bullet., 61, 415–425. (In Chinese)
Zhao, X.-L. (2017). FRP-strengthened metallic structures. CRC Press, Boca Raton, FL.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 7 • July 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jul 19, 2017
Accepted: Jan 5, 2018
Published online: Apr 25, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 25, 2018
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