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Journal of the Korea Concrete Institute

J Korea Inst. Struct. Maint. Insp.
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  • Korea Citation Index (KCI)

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Title The Interfacial Stresses in Concrete Beam Strengthened with Carbon Fiber Sheets due to Temperature Rising
Authors 최형석 ; 김성도 ; 정진환
Page pp.109-118
ISSN 1226-6205
Keywords 탄소섬유시트(CFS) ; 계면전단응력 ; 온도변화 Carbon fiber sheet(CFS) ; Interfacial shear stress ; Temperature changes
Abstract Carbon fiber reinforced polymer(CFRP) can be bonded to the soffit of a concrete beam as a means of repairing and strengthening the beam. In such beams, materials, concrete and carbon fiber sheets, are different in coefficient of thermal expansion. Consequently, interfacial shear stresses can be increased and debonding failure may occur at the plate ends due to temperature rising. This paper presents a method of approximate closed-form solutions for the interfacial shear stresses and conducts a beam test to compare the numerical results. In case of temperature rising over 30℃, interfacial stress of 0.91MPa is occurred at the end of sheet. Therefore, using carbon fiber sheet for strengthening the concrete beam, it is necessary to consider the thermal effects and to evaluate the long time behavior of the concrete beam by temperature change.