TY - GEN
T1 - Fatigue behavior of steel plates strengthened with CFRP sheets at different temperatures
AU - Hu, Lili
AU - Feng, Peng
AU - Cheng, Lu
AU - Zhao, Xiao Ling
N1 - Publisher Copyright:
© 2013 International Institute for FRP in Construction.
PY - 2013
Y1 - 2013
N2 - Carbon fiber reinforced polymer (CFRP) is a popular material in the area of strengthening steel structures, because it has many advantages such as light weight, high tensile strength, high elastic modulus and ease of installation. Recently, studies have shown that steel plates strengthened with CFRP sheets have improved fatigue performance. However, almost no researches are aimed to study temperature effect on fatigue properties of CFRP reinforcement for steel structures. This paper describes an investigation on the behavior of 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 over the glass transition temperature Tg. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with CFRP sheets were tested under cyclic loading at different temperatures. The results prove the effectiveness of CFRP reinforcement technology, which increased fatigue life by 2 to 3.4 times. It is concluded that the variation of temperature has a great influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method at ambient temperature was modified to predict fatigue lives by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved.
AB - Carbon fiber reinforced polymer (CFRP) is a popular material in the area of strengthening steel structures, because it has many advantages such as light weight, high tensile strength, high elastic modulus and ease of installation. Recently, studies have shown that steel plates strengthened with CFRP sheets have improved fatigue performance. However, almost no researches are aimed to study temperature effect on fatigue properties of CFRP reinforcement for steel structures. This paper describes an investigation on the behavior of 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 over the glass transition temperature Tg. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with CFRP sheets were tested under cyclic loading at different temperatures. The results prove the effectiveness of CFRP reinforcement technology, which increased fatigue life by 2 to 3.4 times. It is concluded that the variation of temperature has a great influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method at ambient temperature was modified to predict fatigue lives by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved.
KW - Fatigue life
KW - Fiber reinforced polymer
KW - Resin
KW - Structural strengthening
KW - Temperature
UR - http://www.scopus.com/inward/record.url?scp=84961359137&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:84961359137
T3 - Proceedings of the 4th Asia-Pacific Conference on FRP in Structures, APFIS 2013
BT - Proceedings of the 4th Asia-Pacific Conference on FRP in Structures, APFIS 2013
A2 - Smith, Scott T.
A2 - Zhao, Xiao-Ling
A2 - Bai, Yu
A2 - Almahaidi, Riadh
PB - International Institute for FRP in Construction (IIFC)
T2 - 4th Asia-Pacific Conference on FRP in Structures, APFIS 2013
Y2 - 11 December 2013 through 13 December 2013
ER -