유신기술회보 _ 기술자료 www.yooshin.co.kr | 15 Since the box girder possess excellent torsional stiffness, it has been widely adopted in flyovers or interchanges in urban areas. Otherwise, box girder is comprised of flat steel plates, The design of these girders consists of assigning appropriate boundary conditions to each of these plate elements, ensuring that each plate element does not fail due to local buckling, yielding or an interaction of the both. It also ensures that the girder does not fail due to global buckling. For the stiffened flange in steel box girder, the plate buckling behavior by compression strength can occur during fabrication and erection as well as operation state, so traditionally it should be stiffened in both longitudinal and transverse stiffeners. There are some design specifications to determine the minimum required moment of inertia of stiffener which prevent buckling. In case of Korean Roadway Bridge Specification(2012), based on AASHTO LRFD, the minimum moment incritia equation for longitudnal stiffener requires unreasonabl large value as the number of longitudinal stiffeners increased. Hence the current trend for box girders is for the webs and flanges to be stiffened longitudinally only. However, this article makes a limitation in deciding the cross section shape of box girder and is not applicable to design the wide type orthotropic steel deck in cable-stayed bridge and suspension bridge. This paper introduces some reserches for improving this problem and suggests altenative design specification. 강박스거더교의 압축플랜지 휨강도 평가방법에 대한 고찰 이경훈 1) 임정묵 2) 1. 서론 2. 보강된 판의 탄성좌굴이론 3. 현 설계기준의 종방향보강재 설계규정 4. 보강된 압축플랜지 설계법의 소개 5. 결론 1) 구조부 부사장, 토목구조기술사([email protected]) 2) 구조부 차장, 토목구조기술사([email protected]) A Study on Flexural Strength of Compressional Flange for Box Girder Bridge
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유신기술회보 _기술자료
www.yooshin.co.kr | 15
Since the box girder possess excellent torsional stiffness, it has been widely adopted inflyovers or interchanges in urban areas. Otherwise, box girder is comprised of flat steelplates, The design of these girders consists of assigning appropriate boundary conditions toeach of these plate elements, ensuring that each plate element does not fail due to localbuckling, yielding or an interaction of the both. It also ensures that the girder does not faildue to global buckling.
For the stiffened flange in steel box girder, the plate buckling behavior by compressionstrength can occur during fabrication and erection as well as operation state, sotraditionally it should be stiffened in both longitudinal and transverse stiffeners.
There are some design specifications to determine the minimum required moment ofinertia of stiffener which prevent buckling. In case of Korean Roadway BridgeSpecification(2012), based on AASHTO LRFD, the minimum moment incritia equation forlongitudnal stiffener requires unreasonabl large value as the number of longitudinalstiffeners increased. Hence the current trend for box girders is for the webs and flanges tobe stiffened longitudinally only.
However, this article makes a limitation in deciding the cross section shape of box girderand is not applicable to design the wide type orthotropic steel deck in cable-stayed bridgeand suspension bridge.
This paper introduces some reserches for improving this problem and suggests altenativedesign specification.