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Title |
Experimental Study on the Bond Performance between GFRP Square Tubes and CFRP Plates
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Authors |
정재원(Jae-Won Jeong) ; 최진철(Jin-Chul Choi) ; 박해용(Hae-Yong Park) ; 이용택(Yong-Taeg Lee) ; 김승훈(Seung-Hun Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.4.185 |
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Keywords |
커튼월; GFRP; CFRP plate; 접착 보강재; 부착길이; 평균 부착응력 Curtain wall; GFRP; CFRP plate; Adhesively bonded strengthening material; Bond length; Average bond stress |
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Abstract |
In this study, bond tests were conducted to evaluate the adhesive interfacial bond performance between GFRP square tubes and CFRP plates for curtain wall support frames. The main test variables were bonded length, bonded width, surface treatment method, and adhesive thickness. The specimens were fabricated under untreated, sand-paper treated, and wire-brush treated conditions, and the bond performance was evaluated through tensile loading tests using a universal testing machine. The experimental results showed that most specimens failed by debonding at the CFRP plate?adhesive interface, while tensile rupture of the CFRP plate did not occur. This indicates that the bond performance of the GFRP-CFRP adhesive strengthening system was governed by the load transfer performance of the adhesive interface rather than by the material strength of the CFRP plate. For the specimens with a bonded width of 30 mm, increasing the bonded length from 100 to 200 mm reduced the average bond stress by 54.2% under the untreated condition and by 58.3% under the wire-brushed condition. In addition, a regression equation for the average bond stress and a lower 5% bound equation were proposed based on the relationship between bonded area and average bond stress. Therefore, adhesive-layer quality and the interfacial condition of the CFRP bonding surface should be considered rather than simply increasing the bonded area, and the effective bond length should be further quantified through direct interfacial measurements.
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