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.
Highlights
Fiber reinforced polymer (FRP) composites have gained an increasing use in civil infrastructure applications [1,2,3,4]
Tavakkolizadeh and Saadatmanesh [15] reported a decrease in the strengthening efficiency of carbon fiber reinforced polymer (CFRP) strengthened beams, with the average failure stress of CFRP dropping from 75% of the ultimate tensile strength to 42% as the number of CFRP layers increased from one to five
With an aim to evaluate the effects of these three factors on the failure modes and tensile behavior of strengthened specimens, this paper presents a study on CFRP strengthened steel plates under tensile load
Summary
Fiber reinforced polymer (FRP) composites have gained an increasing use in civil infrastructure applications [1,2,3,4]. Many aspects of the strengthening effects remain unclear, for example, the number of CFRP layers, the bonding schemes (single-sided bonding and double-sided bonding), and elevated temperatures. Tavakkolizadeh and Saadatmanesh [15] reported a decrease in the strengthening efficiency of CFRP strengthened beams, with the average failure stress of CFRP dropping from 75% of the ultimate tensile strength to 42% as the number of CFRP layers increased from one to five. Cao et al [19] studied the tensile properties of CFRP and hybrid FRP at elevated temperatures They pointed out that the degradation in strength of FRP materials at elevated temperatures was due to the softening of the resin matrix, which lost the ability to transfer load among fibers that were in an originally wavy state. Analytical modeling was conducted to predict the mechanical behavior at ambient and elevated temperatures, respectively
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