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A Study for an Evaluation of Flexural Strength of Plate Girders Reinforced with One Line of Longitudinal Stiffeners

수평보강재로 1단 보강된 플레이트거더의 휨강도 평가 방안 연구

  • Received : 2017.04.02
  • Accepted : 2017.07.10
  • Published : 2017.08.27

Abstract

The current AASHTO LRFD and Eurocode 3 specifications have been found to underestimate the flexural strength of longitudinally reinforced plate girders. This is because the web-flange interaction is not considered appropriately when a web is reinforced. The buckling strength of compression flange increases due to the improved rotational restraint to the compression flange. Also, the compression flange and the longitudinal stiffener could constrain the web rotation, so that a certain area of the web reaches yield strength. In this study, a model for evaluating the flexural strength is proposed for plate girders reinforced with one line of longitudinal stiffeners, considering the increase of the buckling strength of the compression flange and the actual stress distribution of the web. The flexural strengths of the conventional steel(SM490) and the high-strength steel(HSB800) plate girders were evaluated from the nonlinear analysis and the applicability of the proposed model was analyzed.

Acknowledgement

Supported by : 부산대학교

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