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School of Civil Engineering, Wuhan University, Wuhan 430072, China





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Academic Editors: Alper Ilki and Masoud Motavalli

Abstract This paper presents the experimental results of steel plates strengthened with carbon fiber reinforced polymer CFRP sheets under tensile load. The number of CFRP layers ranging from one to four, strengthening schemes single-sided and double-sided bonding, and temperatures ranging from 25 to 120 °C were investigated. Results showed that the number of CFRP layers and strengthening schemes had insignificant effects on failure modes of specimens. The failure modes were dominated by the degradation of resin matrix at temperatures lower than Tg + 10 or 20 °C, where Tg is the glass transition temperature, and were dominated by the volume decrease of resin matrix at temperatures above that. Through bonding CFRP sheets, the ultimate load and post-elastic stiffness of specimens were significantly increased. However, the increase in the number of CFRP layers also led to the decrease in strengthening and stiffening efficiency. The double-sided strengthened specimens showed more preferable mechanical properties than the single-sided strengthened specimens. As temperature increased, significant decreases in ultimate load and post-elastic stiffness were observed. Analytical modeling to predict the mechanical properties at ambient and elevated temperatures were conducted, respectively. The modeling results were verified by the test data. View Full-Text

Keywords: carbon fiber reinforced polymer CFRP; steel plates; tensile; failure modes; strengthening; stiffening carbon fiber reinforced polymer CFRP; steel plates; tensile; failure modes; strengthening; stiffening





Autor: Yiyan Lu * , Weijie Li, Shan Li, Xiaojin Li and Tao Zhu

Fuente: http://mdpi.com/



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