Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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A Proposal for an Evaluation of Flexural Resistance of Longitudinally Stiffened Plate Girder with Slender Web

수평보강재로 보강된 세장 복부판을 갖는 플레이트 거더의 휨강도 평가 방법의 제안

  • Park, Yong Myung (Department of Civil Engineering, Pusan National University) ;
  • Lee, Kun Joon (Department of Civil Engineering, Pusan National University) ;
  • Choi, Byung Ho (School of Civil and Environmental Engineering, Hanbat University) ;
  • Back, Sung Yong (School of Civil and Urban Engineering, Inje University)
  • 박용명 (부산대학교 토목공학과) ;
  • 이건준 (부산대학교 토목공학과) ;
  • 최병호 (한밭대학교 건설환경공학과) ;
  • 백성용 (인제대학교 토목도시공학부)
  • Received : 2014.02.05
  • Accepted : 2014.03.31
  • Published : 2014.04.27
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Abstract

In this paper, a series of numerical analyses were performed to evaluate the flexural resistance of steel plate girder with longitudinally stiffened and slender web. The SM490 steel was adopted for the study and the flexural resistances evaluated from the numerical analysis were compared with those suggested by the AASHTO LRFD and the Eurocode 3 codes, respectively. It was found that the AASHTO LRFD code could considerably underestimate the flexural resistance as the web slenderness becomes smaller. This comes from the fact that current AASHTO LRFD code does not consider a possible increase of slenderness limits for compact and noncompct web, and also an additional effect of web restraint on the rotation of compression flange in longitudinally stiffened web. Therefore, the slenderness limits of web and flange have been newly proposed for the plate girders with longitudinally stiffened web and it is analytically verified that the flexural resistance can be appropriately estimated by applying the proposed slenderness limits to the AASHTO LRFD code.

본 연구에서는 수평보강재가 설치된 세장한 복부판을 갖는 플레이트 거더의 휨강도 평가를 위한 해석적 연구를 수행하였다. SM490강재를 대상으로 해석에서 구해진 휨강도를 AASHTO LRFD 기준 및 Eurocode 3 기준과 비교한 결과, 특히 AASHTO LRFD 기준은 수평보강재로 보강된 복부판의 세장비가 감소함에 따라 휨강도를 크게 과소평가하는 것으로 나타났다. 그 원인은 현재 AASHTO LRFD 기준은 수평보강재 보강에 따른 복부판의 비조밀 및 조밀 한계세장비 증가를 고려하지 않은 점과 보강 복부판이 압축플랜지의 회전을 구속하는 효과가 증가하는 것을 적절히 고려하지 않기 때문으로 분석되었다. 이에 본 연구에서는 보강 시 복부판과 플랜지의 한계세장비를 제안하였으며, 이를 AASHTO LRFD 기준에 적용함으로써 휨강도를 비교적 합리적으로 평가할 수 있음을 제시하였다.

Keywords

References

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  1. Experiments on Flexural Resistance of Longitudinally Stiffened Plate Girder with Slender Web vol.26, pp.6, 2014, https://doi.org/10.7781/kjoss.2014.26.6.595
  2. 수평보강재로 1단 보강된 플레이트거더의 휨강도 평가 방안 연구 vol.29, pp.4, 2017, https://doi.org/10.7781/kjoss.2017.29.4.281