A Study on the Fatigue Line with Plastic Rotaional Angle for Steel Structure of the Beam-to-Column Joints

기둥-보 연결 강구조물의 소성회전각에 의한 피로곡선 연구

  • 공병승 (삼성물산(주) 건설부문 토목기술팀)
  • Received : 1998.03.18
  • Published : 1998.06.30

Abstract

This study presents a fatigue line with a plastic rotational angle to a great extent of plastic strain of Low-Cycle-Fatigue period, such as earthquake, etc. This fatigue line with a plastic rotational angle is measured and analysed more simply in practice rather than Woehler's fatigue line which is developed in stress variation of the structure. It shows that the slope of fatigue line with a plastic rotational angle is equal to that with plastic strain through the experiments by proving the correlation that the plastic strain ratio is directly proportional to the plastic rotational angle in plastic hinge. The theory is induced by Manson and Coffin strain fatigue line, and the experiments are tested by ECCS. The location of the plastic hinge is achieved and accurate plastic strain ratio is calculated through FEM.

본 연구에서는 지진 등과 같이 소성변형의 범위가 큰 Low-Cycle-Fatigue 범주에서 구조물의 응력변동을 중심으로 사용되는 기존의 피로곡선인 S-N선도 보다 실질적으로 간단하게 측정하여 분석할 수 있는 소성회전각에 의한 피로곡선을 제시하였다. 이는 소성힌지가 생성되는 곳의 소성변형율과 구조물의 소성회전각이 서로 정비례를 이루는 상관관계임을 입증하여, 실험을 통하여 밝혀진 소성변형율의 피로곡선의 기울기와 소성회전각의 기울기가 서로 같은 값을 가짐을 보여 주었다. 이론은 Manson과 Coffin의 변형을 피로곡선을 도입하였고, 실험은 ECCS 주관하에 실시하였으며, 수치해석을 통하여 소성힌지 부위의 위치와 정확한 소성변형율을 산정할 수 있었다.

Keywords

References

  1. Seismic design method Part 1, Commission of european union Eurocode 8
  2. SERICON : An international data base of beam-to-column joints out of steel Sedlacek, G.;Weynand, K.(et al.)
  3. Proc. ASTM Interfaces between fatigue, creep and fracture Manson, S.S.
  4. Proc. Intn. Mech. Engrs. v.188 Fatigue at high temperature-prediction and interpretation Coffin, L.F. Jr.
  5. Journal of constructional steel research v.29 Seismic behaviour of steel sections Ballio, G.;Castiglioni, C.A.
  6. DINGO. Dreidimensionaler Interaktiver Netzgenerator mit Graphischer Oberflaeche Bohmann, D.;Sedlacek, G.
  7. Beitrag zur numerischen Simulation des Momenten-Rotationsve-rhaltens von geschweissten und geschr-aubten Stuetzen-Riegel-Verbindungen unter monotonen und zyklischen Belastungen 공병승
  8. Bruchmechanische Sicherheits-analyse im Stahlbau, Abschlussbericht, AIF-No.9044 Sedlacek, G.;Dahl, W.
  9. Zur Rotations-kapazitaet von I-Profilen statisch und dynamisch belasteter Traeger Feldmann, M.
  10. Materials data for cycle loading, Part A: Unalloyed steels, Part B: Low-Alloy steels, Materials science monographs. Vol. 42a/b Boller, Ch.;Seeger, T.
  11. Seismic resistance of composite structures, Final report, C.E.C. Agreement No. 7210-SA/506 Ballio, G.;Sedlacek, G.(et al.)
  12. Grenze fuer alterniernde Plastizierung von Stahlbauelementen, Abschlussbericht, AIF-Nr.10024B Sedlacek, G.;Feldmann, M.;공병승
  13. Das Rotationsverhalten von Stuetzen-Riegel-Verbindungen, Abschlussbericht, DFG Se351/19-1 Sedlacek, G.;공병승
  14. recommended testing procedure for accessing the behaviour of structural steel elements under cycle loads ECCS (European Convention for Constructional Steelwork)