Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Fatigue Characteristics according to the Shape of Cover Plate in Steel Plate Girders

강판형의 덮개판 형상에 따른 피로특성

  • 정영화 (강원대학교 토목공학과) ;
  • 홍성욱 (한림정보산업대학 토목과) ;
  • 김익겸 (강원대학교 토목공학과) ;
  • 정진석 (강원대학교 토목공학과)
  • Received : 1999.12.15
  • Published : 2000.04.27
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Abstract

In this study, A series of fatigue tests have been performed on the fillet welded joints of cover plates in steel plate girders in order to quantitatively assess the fatigue characteristics according to the shapes of cover plates. From the results of fatigue tests, it has been shown that the fatigue strengths were slightly different according to their shapes, but satisfied the fatigue design curves in Korea and other countries. Also, from the results of beachmark tests, it has been confirmed that the points of fatigue crack initiation were closely related to the shapes of weld bead toes, and fatigue cracks simultaneously initiated from several points in weld bead toes have been grown as semi-elliptical surface cracks, and these cracks have been coalesced each other, and grown as through thickness cracks, and finally reached to fracture. Besides, from the results of fracture mechanics approaches, stress gradient factors were the most dominant factors among crack correction factors obtained from the existing equations and finite element analysis, and the fatigue life on fillet welded joints of cover plates could be estimated using the relations between fatigue crack growth rate and stress intensity factor range obtained from finite element analysis.

이 연구에서는 덮개판 형상이 피로특성에 미치는 영향을 정량적으로 평가하기 위해서 강교량을 구성하는 구조세목 중 덮개판 필렛용접부를 대상으로 일련의 피로실험을 실시하였다. 피로실험결과 덮개판 형상에 따라 피로강도에 다소 차이를 나타내고 있었으나 국내 및 외국의 피로설계기준을 만족함을 알 수 있었다. 또한 비치마크실험결과로부터 피로균열 발생점은 용접지단부의 형상에 밀접하게 관련되어 있음을 확인할 수 있었으며, 용접지단부의 여러 곳에서 동시다발적으로 발생한 피로균열이 반타원형의 표면균열의 형태로 성장하고 이 균열이 서로 합체되어 관통균열의 형태로 성장함으로써 결국 파단에 이르렀다. 한편, 파괴역학적 해석결과로부터 기존의 제안식 및 유한요소해석에서 구한 균열보정 계수 중기하학적형상보정계수가 가장 지배적임을 알 수 있었으며, 피로균열성장속도와 유한요소해석에서 구한 응력확대계수범위 사이의 관계로부터 덮개판 필렛용접부의 피로수명을 산정 할 수 있었다.

Keywords

References

  1. Stress Concentration and Fatigue of Welded Details Zettemoyer, N.
  2. Welding Research Supplement Stress Gradient Correction Factor for Stress Intensity at Welded Stiffeners and Cover Plates Zettlemoyer, N.;Fisher, J.W.
  3. The Stress Analysis of Crack Handbook Tada, H.;Paris, P.C.;Irwin, G.R.
  4. Journal of the Structural Division, Proceedings of the ASCE v.103 no.ST2 Rapid Calculation of Stress Intensity Factors Albrecht, P.A.;Yamada, K.
  5. International Journal of Fracture Mechanics v.11 no.2 An Analysis of Fatigue Cracks in Fillet Welded Joints Maddox, S.J.
  6. Fracture and Fatigue Control in Structures-Application of Fracture Mechanics Rolfe, S.T.;Barsom, J.M.
  7. Engineering Fracture Mechanics v.5 Fatihue Crack Growth in Welded Beams Hirt, M.A.;Fisher, J.W.
  8. Effects of Weldments on the Fatigue Strength of Steel Beams, NCHRP Report No.102, National Cooperative Highway Research Program Fisher, J.W.;Hirt, M.A.;McNamee, B.M.;Frank, K.H.
  9. Fatigue Strength of Steel Beams with Welded Stiffeners and Attachments, NCHRP Report No. 147 Fisher, J.W.;Albrecht, P.A.;Klingerman, D.J.;Yen, B.T.;McNamee, B.M.
  10. Subcritical Crack Growth and Fracture of Bridge Steels, NCHRP Report No. 181 Barsom, J.M.;Novak, S.R.
  11. Detection and Repair of Fatigue Damage in Welded Highway Bridges, NCHRP Report No. 206 Fisher, J.W.;Sullivan, M.D.;Pense, A.W.;Hausammann, H.
  12. Fatigue Behavior of Full-Scale Welded Bridge Attachments, NCHRP Report No.227 Fisher, J.W.;Mertz, D.R.;Edinger, J.A.;Barthelemy, B.M.
  13. Fatigue Resistance of Full Scale Cover-Plated Beams, Fritz Engineering Laboratory Report 386-9 Slockbower, R.F.;Fisher, J.W.
  14. Proceedings of IABSE Colloquium-Lausanne, Fatigue of Steel and Concrete Structures Fatigue Life Estimation using Fracture Mechanics Yamada, K.;Hirt, M.A.
  15. Proceedings of IABSE Colloquium-Lausanne, Fatigue of Steel and Concrete Structures Fatigue Testing of Welded Beam Berger, P.
  16. Fatigue Strength of Welded Steel Element, Technical Report 79 Comeau, M.P.;Ku1ak, G.L.
  17. Loading History Span No.10 Yellow Mill Pond Bridge I-95 Bridgeport, Connecticut, Research Project HPR Bowers, D.G.
  18. Determination of Tolerable Flaw Sizes in Full Size Welded Bridge Details, Final Report No.FHWA- RD-77-170 Roberts, R.;Fisher, J.W.;lrwin, G.R.;Boyer, K.D.;Krishna, G.V.;Morf, V.;Hausammann, H.;Slockbower, R.E.
  19. British Welding Journal v.14 no.2 Factors Affecting the Fatigue Strength of Welded High Strength Steels Signes, F.G.;Baker, R.G.;Harrison, J.D.;Burdekin, F.M.
  20. K-Value Analysis for Cracks in Bridge Structures, Fritz Engineering Laboratory Report No. 339 Tada, H.;lrwin, G.R.
  21. Standard Highway Specification -Design/Construction&Maintenance Ministry of Construction & Transportation
  22. Lusas Thoery Manual et al LUSAS
  23. Fatigue and Fracture in Steel Bridges Fisher, J.W.
  24. 剛構造物の波勞設計指針.同解說 日本剛構造協會(編)
  25. Standard Specification for Highway Bridges AASHTO
  26. 鋼橋における劣化現象と損傷の評價 日本土木學會(編)
  27. 溶接强度ヘソドブック 佐藤邦彦
  28. Trans. of ASME, Series-D v.85 no.4 A Critical Analysis of Crack Propagation Laws Paris, P.C.;Erdogan, F.