A comparative study on fatigue behaviour of steel beams retrofitted with welding,pultruded CFRP plates and wet layup CFRP sheets |
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| Affiliation: | 1. School of Engineering, University of Tasmania, Tasmania 7001, Australia;2. School of Engineering, University of Western Sydney, NSW 1797, Australia;3. Department of Civil Engineering, Monash University, Vic. 3168, Australia;1. Constructed Facilities Center, Department of Civil and Environmental Engineering, West Virginia University, P.O. Box 6103, Morgantown, WV 26506-6103, USA;2. School of Engineering and Engineering Technology, LeTourneau University, P.O. Box 7001, Longview, TX 75607-7001, USA;1. Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu, Gifu, 501-1193, Japan;2. Joint Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu, Gifu, 501-1193, Japan;3. Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, Kagawa, 761-0395, Japan;4. Molecular Composite Medicine Research Group, Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan;5. Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu, Gifu, 501-1193, Japan;1. IUAV University of Venice, Laboratory of Strength of Materials, Via Torino 153/a, 30121 Venice, Italy;2. IUAV University of Venice, Department of Design in Complex Environment, Dorsoduro 2206, Convento delle Terese, 30123 Venice, Italy;1. Department of Mechanical Engineering, Politeknik Kota Kinabalu, Jalan Politeknik, 88450 Kota Kinabalu, Sabah, Malaysia;2. School of Engineering and Information Technology, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia;3. Department of Civil Engineering, Faculty of Engineering, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia |
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| Abstract: | This paper investigates the fatigue behaviour of defected steel beams retrofitted with three different methods, i.e., welding, welding and bonding with CFRP plates or CFRP woven sheets laminated via a wet lay-up process. Two different types of CFRP materials and two types of epoxies were selected in this study. An initial cut was made on the tensile flange in the mid span of each beam. Different failure modes were observed for beams retrofitted with CFRP plates and CFRP sheets. It was found that one layer of CFRP plate and epoxy strengthening system can extend the fatigue life of steel beams about 7 times comparing with beams repaired with solely welding method, while the fatigue life was extended abound 3 times for beams strengthened with 4 layers of CFRP woven sheets. Mean S–N curves were obtained based on the test data, that can be used to predict the fatigue life of steel beams retrofitted with similar CFRP materials. The crack propagation rate was measured using strip strain gauges. The CFRP plates showed better performance in resisting crack propagation than CFRP sheets under fatigue loading conditions. The relationship between the maximum stress and the crack propagation rate could be used to predict the crack length of beams retrofitted with similar CFRP strengthening systems. |
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