The Fatigue Behavior of Steel Structures under Random Loading
|
| Journal |
Key Engineering Materials (Volumes 378 - 379) |
| Volume |
Advances in Understanding the Fatigue Behavior of Materials |
| Edited by |
Dr. T. S. Srivatsan, FASM, FASME |
| Pages |
3-16 |
| DOI |
10.4028/www.scientific.net/KEM.378-379.3 |
| Online since |
March, 2008 |
| Authors |
Henning Agerskov
|
| Keywords |
Fatigue, Fatigue Test, Fracture Mechanics, Random Loading, Steel, Steel Structure |
| Abstract |
Fatigue damage accumulation in steel structures under random loading has been studied
in a number of investigations at the Technical University of Denmark. 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 with a total of 540 fatigue tests 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 or high-strength
steel. 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. |
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