Journal of
Engineering and Technology Research

  • Abbreviation: J. Eng. Technol. Res.
  • Language: English
  • ISSN: 2006-9790
  • DOI: 10.5897/JETR
  • Start Year: 2009
  • Published Articles: 192

Full Length Research Paper

A combined high and low cycle fatigue model to estimate life of steel bridges

  Kamal Karunananda1*, Mitao Ohga1, Ranjith Dissanayake2 and Sudath Siriwardane1
  1Department of Civil and Environmental Engineering, Ehime University, Bunkyo-cho 3, Matsuyama 790-8577, Japan. 2Department of Civil Engineering, University of Peradeniya, Peradeniya 20400, Sri Lanka.
Email: [email protected]

  •  Accepted: 26 July 2010
  •  Published: 31 August 2010



This paper proposes a new model to estimate life of structures for combined damage of high and low cycle fatigue. The model mainly consists of a new damage indicator and strain-life fatigue curve. The model predictions are verified by comparing with fatigue test results of some materials. The proposed model is applied to estimate the fatigue life of a bridge member for combined damage of high cycle and low cycle fatigue caused by usual traffic and earthquake loadings. Finally, the importance and applicability of the proposed model is confirmed.


Key words: High cycle fatigue, low cycle fatigue, combined damage, railway, bridge.