Study on thermal effects on fatigue behavior of cracked steel plates strengthened by CFRP sheets |
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| Affiliation: | 1. The Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2. Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia;3. Department of Civil Engineering, Xi׳an University of Architecture and Technology, China;1. Department of Building Engineering, Tongji University, Siping Road, Shanghai 200092, China;2. Department of Civil Engineering, Monash University, Wellington Road, Clayton, VIC 3800, Australia;3. School of Applied Sciences and Engineering, Monash University, Northways Road, Churchill, VIC 3842, Australia;1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Structural Engineering Research Laboratory, Dübendorf, Switzerland;2. EPFL, Swiss Federal Institute of Technology Lausanne, Steel Structure Laboratory (ICOM), Lausanne, Switzerland;3. University of Arkansas, Department of Civil Engineering, Fayetteville, AR, USA;4. ETHZ, Swiss Federal Institute of Technology Zürich, Institute of Structural Engineering (IBK), Zürich, Switzerland;5. University of Tehran, School of Civil Engineering, Tehran, Iran;1. Beijing Engineering Research Center of Steel and Concrete Composite Structures, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2. The Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;3. East China Architectural Design & Research Institute, Shanghai 200002, China;1. University of Duhok, Duhok, Iraq;2. Swinburne University of Technology, Melbourne, Australia |
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| Abstract: | Carbon fiber reinforced polymer (CFRP) sheets have been used to strengthen steel structures to enhance fatigue life. However there is very limited information on the influence of temperatures on the fatigue strengthening efficiency. This paper describes an investigation on the behavior of cracked steel plates strengthened with CFRP at different temperatures. Firstly, through cylinder coupon tests, mechanical properties of the resin were found to vary at different temperatures, especially when the temperature exceeds the glass transition temperature Tg. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with high modulus CFRP sheets were tested under fatigue loading at different temperatures. The results prove the effectiveness of CFRP strengthening technology to increase fatigue life when the temperature ranges from −40 °C up to 60 °C. It is concluded that the variation of temperature has an obvious influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method to predict fatigue lives of CFRP strengthened steel plates at ambient temperature was modified by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved. The influence of the number of CFRP layers and CFRP modulus is also found based on the proposed analytical method. |
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| Keywords: | Fiber reinforced polymer Structural strengthening Resin Fatigue life Temperature |
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