Fatigue in Steel Structures under Random Loading

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    Fatigue damage accumulation in steel structures under random loading is studied. The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series have been carried through on various types of welded plate test specimens and full-scale offshore tubular joints. The materials that have been used are either conventional structural steel with a yield stress of ~ 360-410 MPa or high-strength steel with a yield stress of ~ 810-1010 MPa. The fatigue tests and the fracture mechanics analyses have been carried out using load histories, which are realistic in relation to the types of structures studied, i.e. primarily bridges, offshore structures and chimneys. In general, the test series carried through show a significant difference between constant amplitude and variable amplitude fatigue test results. Both the fracture mechanics analysis and the fatigue test results indicate that Miner's rule, which is normally used in the design against fatigue in steel structures, may give results, which are unconservative, and that the validity of the results obtained from Miner's rule will depend on the distribution of the load history in tension and compression.
    Original languageEnglish
    Title of host publicationProc. of Eurosteel '99, 2nd European Conference on Steel Structures
    Place of PublicationPrag
    PublisherCzech Technical University
    Publication date1999
    Publication statusPublished - 1999
    Event2nd European Conference on Steel Structures - Prag, Czech Republic
    Duration: 26 May 199929 May 1999
    Conference number: 2


    Conference2nd European Conference on Steel Structures
    CountryCzech Republic
    Internet address

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