Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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A Study on Plastic Fatigue of Structural Steel Elements under Cyclic Loading

반복하중을 받는 강구조 요소의 소성피로에 관한 연구

  • 박연수 (전남대학교 공과대학 토목공학과) ;
  • 박선준 (전남대학교대학원 토목공학과) ;
  • 강성후 (동신대학교 공과대학 토목공학과) ;
  • 윤영필 (목포실업전문대학 토목과)
  • Received : 1997.04.21
  • Published : 1997.06.30
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Abstract

In order to quantify the relationships of the important physical factors relating failure to strong earthquake loading, the plastic fatigue problems for structural components under repeated loading were reviewed first. A new concept of very low cycle fatigue failure for structural components under severe cyclic excitations as in strong earthquakes was represented. Also, an experimental study was made of the very low cycle fatigue failure of structural steel elements. It was attempted to realize the ultimate failure in the course of loading repetitions of the order of several to twenty. The test specimen had a form of rectangular plate, representing a thin-plated element in a steel member as wide-flange cross section. It was subjected to uniaxial loading repeatedly, until complete failure takes place after undergoing inelastic buckling, plastic elongation and/or their combination. It was seen as a result that the state of the ultimate failure is closely related to the maximum strain at the extreme fiber in the cross section.

본 연구에서는 먼저 강한 지진하중에 의해 발생되는 구조물의 파괴와 관련되어 있는 중요한 물리적 인자들의 상호관계를 정량화하기 위하여 반복하중을 받는 구조성분들에 대한 소성피로 문제에 대해서 검토하였으며, 강한 지진과 같은 극심한 반복하중하에서 구조성분들에 대한 극저사이클 피로파괴의 새로운 개념이 도입되었다. 또한 강구조물 요소에 대한 극저사이클 피로파괴 실험을 실시하였다. 실험은 수회에서 20회사이의 반복하중재하 과정에서 궁극적인 파괴를 실현하기 위하여 시도 되었다. 시험체는 H형강의 플랜지 단면처럼 강부재내의 않은 평판요소를 의미하는 직사각형 평판을 사용하였다. 이 시험체에는 비탄성좌굴, 소성신장 또는 이들 2가지의 조합이 발생한 후 부재가 완전히 파괴에 이를때까지 축방향 반복하중을 가하였다. 그 결과 극저사이클 피로하중에 의한 극한파괴상태는 구조요소단면 최외단에서의 최대변형율과 밀접하게 관련되어 있슴을 알 수 있었다.

Keywords

Acknowledgement

Supported by : 전남대학교

References

  1. Damage Process of Steel Members under Very-Low-Cycle Loading Park, Y.S.
  2. Journal of Structural Engineering, ASCE v.122 no.2 Very-Low-Cycle Failure Process of Steel Angle Members Park, Y.S.;Iwai, S.;Kamada, H.;Nonaka, T.
  3. ASME v.12 Cumulative in Fatigue, Jour. Applied Mechanics Miner, M.A.
  4. Fracture and Fatigue Control in Structure (application of fractural mechanics) Rolfe, S.T.;Barsom, J.M.
  5. Strength Material Yokobori, T.
  6. J. Sbuct Engrg., ASCE v.117 no.8 Stitch Spacing and Local Buckling in SeismicResistant Double-Angle Braces Aslani, F.;Goel, S.C.
  7. J. Sbuct. Div., ASCE. v.98 no.5 Beam-CoIumn Subassemblages Under Repeated Loading Bertero, V.V.;Popov, E.P.;Krawinkler, H.
  8. Inelastic Buckling of Steel Sbuts under Cyclic Load Reversals;Rep. No. UCB/EERC-80/40 Black., R.G.;Billwenger, W.A.;Popov, E.P.
  9. Annuals of Disartcr Prrvcnrion Res. Inst., Kyoto, Japan v.17B A Consideration on Failure Process of Structural Steel under Repeated Flexural Loads Goto, H.;Kameda, H.;Koike, T.;Izunami, R.;Wakita, K.;Sugihara, Y.
  10. Proc. 8th World Conf. Earthq. Eng. v.6 Cumulative Damage of Welded Beam-to-Column Connections in Steel Sbuctures subjected to Desbucive Earthquakes Kaneta, K.;Kohzu, I.;Nishizawa, T.
  11. Trans. AIJ no.175 Load-Deflection Behaviors and Plastic Fatigue of Wide-Flange Beams Subjected to Alternating Plastic Bending Part I Experimental Investigation Tanabashi, R.;Yokoo, Y.;Wakabayashi, T.;Nakamura, M.;Kunieda, H.;Matsunara, H.;Kubot, T.
  12. Trans. AIJ no.176 Load-Deflection Behabiors and Plastic Fatigue of Wide-Flange Beams Subjected to Alternating Plastic Bending Part II Hysteretic and Skeleton Stress-Strain Relations and Plastic Fatigue of Flange Tanabashi, R.;Yokoo, Y.;Nakamura, T.;Kubota, T.;Yarmrrnto, A.
  13. Trans. AJJ no.177 Load-Deflection Behavior and Plastic Fatigue of Wide-Flange Beams Subjected to Altenating Plastic Ben:Iing Part Ill Steady-State Theay Tanabasi, R.;Yokoo, Y.;Nakamura, T.
  14. Computers and Structure v.16 no.1-4 Cumulative Damage in Steel Structures Subjected to Earthquake Ground Motions Krawinker, R.;Zohrei, M.
  15. IUTM Symposiwn Herrenalb Instability under Cycles of Plastic Deformation;Instability of Continuous Systems Neale, K.;Schroeder, J.;Leipholz, R.(ed.)
  16. 4th World Conf. Earthq. Eng., Santiago v.1 no.B2 Low Cycle Fatigue Fracture Limit of Various Kinds of Structural Members Subjected to Alternately Reported Bending under Axial Corrpression as an Evaluation Basis or Design Criteria for Seismic Capacity Yamada, M.