Publication: Research - peer-review › Journal article – Annual report year: 2012
Fatigue damage accumulation in aluminium highway bridges under random loading is studied. The fatigue life of welded joints has been determined both from fracture mechanics analyses and from experimental investigations. The fatigue life of welded plate specimens has been investigated. The material that has been used has a 0.2% proof strength of 310 MPa and an ultimate tensile strength of 327 MPa. The fracture mechanics analyses and the fatigue tests have been carried out using load histories, which correspond to one week's traffic loading, determined by means of strain gauge measurements on the deck structure of the Farø Bridges in Denmark. The results obtained in the present investigation show a significant difference between constant amplitude and variable amplitude results. Both the fracture mechanics analyses and the fatigue test results indicate that Miner's rule, which is normally used in the design against fatigue in aluminium bridges, may give results which are unconservative. The validity of the results obtained from Miner's rule will depend on the distribution of the load history in tension and compression.
|Journal||International Journal of Fatigue|
|Number of pages||43|
- Fracture mechanics, Random loading, Variable amplitude fatigue, Damage accumulation, Aluminium structures