A Study on the Fatigue Behavior of the Welded Structural Details in Plate Girder

플레이트거더 용접구조상세의 피로거동에 관한 연구

  • Lee, Myeong-Gu (Department of Health Industrial Safety, Eulji University) ;
  • Lee, Seung-Yong (Department of Civil Engineering, Chungju National University)
  • 이명구 (을지대학교 보건산업안전학) ;
  • 이승용 (충주대학교 토목공학부)
  • Published : 2008.04.30


The objective of this study is to examine fatigue strength of the welded details. In order to attain the goal of this study, the bending fatigue tests was performed for four kinds of welded details used in steel bridges, such as in-plane gusset, out-of-plane gusset, cruciform, and cover plate. The effect of the length of welded attachment on fatigue strength was greater in out-of-plane gusset than in in-plane gusset. The fatigue strength of welded details with short attachment was superior to that with long attachment. Fatigue strength of welded details with transversely loaded welds was lower than that with longitudinally loaded welds, and those results were not satisfied with AASHTO specifications. For the fatigue strength of cover plate, cover plate with rectangular section was superior to that with tapered section. It was found that the fatigue crack initiates at the points of stress concentration which are the boundary between the base metal and the bead of weld in the part of the longitudinal edge of attachment, and propagates first along the boundary and along the perpendicular to the direction of the principle stress in the base metal of welded tip.


plate girder;structural details;fatigue strength;fatigue crack


  1. W.M. Wilson, 'Flexural Fatigue Strength of Steel Beams', Eng. Exper. Sta. Bull., No. 377, Univ. of Ollinois, Vol. 45, No. 33, 1948
  2. 松岡一洋, 高橋一比古, 藤井英輔, '荷重非傳達隅 肉鎔接繼手の疲勞强度に及ぼす降伏强度の影響', 日本造船學會論文集, 第171號, pp. 417-425, 1992
  3. 한국강구조학회, '강교량 구조상세의 피로강도실험', pp. 75-95, 1997
  4. T.R. Gurney, 'Fatigue Strength of Beams with Stiffness Welded to the Tension Flange', Brit. Welding Juurnal, 1960
  5. ECCS(European Convention for Constructional Steelwork), 'Recommendations for the Fatigue Design of Steel Structure', Committee TC 6, Fatigue, 1985
  6. 장동일, 박제선, 정영화, '강구조물의 용접연결부의 피로강도에 관한 연구(I)', 대한토목학회논문집, 제5권, 제3호, pp. 161-175, 1985
  7. 우상익, 정경섭, '하중 비전달형 면외 거셋판이 부착된 강교량 부재의 피로강도', 한국강구조학회논문집, 제10권, 제4호, pp. 779-788, 2005
  8. J. H. Fisher, 'Fatigue Strength of Welded A514 Steel Beams', Pro. Conf. Fatigue of Welded Structures, The Welding Institute, Vol. 1, pp. 135-148, 1971
  9. 장동일, 정영화, '용접이음한 구조강의 소형인장시험편에서의 피로균열 진전거동', 대한토목학회논문집, 제4권, 제2호, pp. 133-142, 1984
  10. 三木千壽, '鋼橋梁部材の疲れ强度評價に關する 基礎的な硏究', 東京工業大學, 博士學位論文, 1979
  11. 日本鋼構造協會(JSSC), '鋼構造物の疲勞設計指針.同解說', 技報堂出版, pp. 5-12, 1993
  12. 건설교통부, '도로교설계기준', pp. 69-77, 2005
  13. AASHTO(American Association of State Highway and Transportation Officials), 'Standard Specification for Highway Bridges', pp. 144-147, 1986
  14. 慶甲秀, 森猛, 三木千壽, 剛志, '高强度鋼溶接継 手部の溶接材料軟質化による疲勞强度向上の試み',日本土木學會論文集, No.570, I-40, pp. 97-106, 1997