In this paper especially the evaluation of railway bridges concerning fatigue is considered. The design loading scheme of the UIC is used as a reference to compare the load carrying capacity of existing bridges designed according to different loading schemes and different allowable stresses. Stress spectra of a standard train traffic with stress ranges in proportion to the stress range due to the UIC-loading are the base of a first step of the fatigue life estimation. The influence of identification of SN-curves and the composition of the train traffic is shown. As a further approximation a fatigue assessment procedure is shown using data of annual tonnage. To verify the magnitude of calculated stresses in-situ measurements are mentioned. Inspection procedures have to be established if the remaining life is negative or uncertain. Some examples are given of the calculation of inspection intervals using fracture mechanics. The risk of brittle fracture of some kinds of old steel used in riveted and welded structures is pointed out. The fatigue behaviour of some special structural details is shown.
Evalution of existing structures
Bewertung von bestehenden Strukturen
Fatigue Aspects in Structural Design, Int. Symp. of the ; Oct ; 97-118
1989
22 Seiten, 24 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
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