Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Numerical Study on Required Stiffness of Longitudinal Stiffener in Plate Girders

플레이트 거더의 수평보강재 필요 강성에 관한 해석적 연구

  • Received : 2015.12.23
  • Accepted : 2016.01.21
  • Published : 2016.02.27
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Abstract

A numerical study on required stiffness of the longitudinal stiffener in the webs stiffened with flat plate at one-side of the web was conducted. The longitudinal stiffeners are commonly placed around 0.2D, i.e., 1/5 the web depth due to fabrication convenience although most plate girders for bridges are unsymmetric section. Considering asymmetry of section, aspect ratio of web and the rigidity ratio of longitudinal stiffener(${\gamma}^*$), eigenvalue analysis were performed to evaluate the buckling strength for the webs with a stiffener located at 0.16D~0.24D. Based on the parametric analysis, the required stiffness of the longitudinal stiffener to satisfy the buckling strength specified in AASHTO LRFD specifications was presented.

본 연구에서는 판 형상의 수평보강재가 한쪽에만 설치되는 통상적인 보강 웨브에서 수평보강재의 필요 강성에 대한 해석적 연구를 수행하였다. 실제 교량용 플레이트 거더는 대부분 비대칭 단면이지만 제작성을 감안하여 수평보강재를 통상 웨브 높이의 1/5인 0.2D 부근에 설치하고 있다. 이러한 점을 감안하여 보강재가 0.16D~0.24D 범위에 설치되는 조건에 대해 단면의 비대칭성과 웨브의 형상비를 고려하여 수평보강재의 강성비(${\gamma}^*$)에 따른 고유치 해석을 수행하고 좌굴강도를 평가하였다. 이로부터 AASHTO LRFD 기준의 좌굴강도를 만족하는 수평보강재의 필요 강성을 제안하였다.

Keywords

References

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