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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
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- 국제구조공학회 Structural Engineering and Mechanics, An Int'l Journal Structural Engineering and Mechanics, An Int'l Journal Vol.69 No.2
- 발행연도
- 2019.1
- 수록면
- 193 - 204 (12page)
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This paper presents results from experimental and numerical studies on the response of steel-concrete composite box bridge girders under certain localized fire exposure conditions. Two composite box bridge girders, a simply supported girder and a continuous girder respectively, were tested under simultaneous loading and fire exposure. The simply supported girder was exposed to fire over 40% of its span length in the middle zone, and the two-span continuous girder was exposed to fire over 38% of its length of the first span and full length of the second span. A measurement method based on comparative rate of deflection was provided to predict the failure time in the hogging moment zone of continuous composite box bridge girders under certain localized fire exposure condition. Parameters including transverse and longitudinal stiffeners and fire scenarios were introduced to investigate fire resistance of the composite box bridge girders. Test results show that failure of the simply supported girder is governed by the deflection limit state, whereas failure of the continuous girder occurs through bending buckling of the web and bottom slab in the hogging moment zone. Deflection based criterion may not be reliable in evaluating failure of continuous composite box bridge girder under certain fire exposure condition. The fire resistance (failure time) of the continuous girder is higher than that of the simply supported girder. Data from fire tests is successfully utilized to validate a finite element based numerical model for further investigating the response of composite box bridge girders exposed to localized fire. Results from numerical analysis show that fire resistance of composite box bridge girders can be highly influenced by the spacing of longitudinal stiffeners and fire severity. The continuous composite box bridge girder with closer longitudinal stiffeners has better fire resistance than the simply composite box bridge girder. It is concluded that the fire resistance of continuous composite box bridge girders can be significantly enhanced by preventing the hogging moment zone from exposure to fire. Longitudinal stiffeners with closer spacing can enhance fire resistance of composite box bridge girders. The increase of transverse stiffeners has no significant effect on fire resistance of composite box bridge girders.
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참고문헌 (34)
참고문헌 신청
Alos-Moya, J. / 2014 / Analysis of a bridge failure due to fire using computational fluid dynamics and finite element models / Eng. Struct 68:96~110
Alos-Moya, J. / 2017 / Valencia bridge fire tests : Experimental study of a composite bridge under fire / J. Constr. Steel Res 138:538~554
American Association of State Highway and Transportation Officials / 2007 / AASHTO LRFD Bridge Design Specifications / AASHTO
American Society for Testing and Materials / 2014 / Standard Test Methods for Determining Effects of Large Hydrocarbon Pool Fire on Structural Members and Assemblies, ASTM E1529-14a
ANSYS / 2013 / ANSYS Metaphysics (Version 14.5) / ANSYS Inc
Alos-Moya, J. / 2017 / Valencia bridge fire tests : Experimental study of a composite bridge under fire / J. Constr. Steel Res 138:538~554
American Association of State Highway and Transportation Officials / 2007 / AASHTO LRFD Bridge Design Specifications / AASHTO
American Society for Testing and Materials / 2014 / Standard Test Methods for Determining Effects of Large Hydrocarbon Pool Fire on Structural Members and Assemblies, ASTM E1529-14a
ANSYS / 2013 / ANSYS Metaphysics (Version 14.5) / ANSYS Inc
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