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Obliczanie na zmęczenie betonowych konstrukcji mostowych wg PN-EN

Jankowiak I., Madaj A.

Archiwum Instytutu Inżynierii Lądowej

2011

Nr 10

105-127

Cyclic loads may cause damage in the constructions as a result of fatigue. General rules for determining all effects on bridges are specified in PN-EN 1990 and Appendix A2. Verification if there is no structural damage due to fatigue should be performed in accordance with the scheme of PN-EN, include the scope of the Ultimate Limit Stage (ULS) verifications. For the reason, that fatigue failure does not occur as a result of the load of a fixed maximum value but as a result of repetition of imposing load on an average level of internal forces, the effect of fatigue depends strongly on the properties of construction materials - steel and concrete. Thus, the effect, in the form of fatigue may be quite different in the case of steel bridges, concrete bridges or even a composite steel-concrete bridges. Therefore, the rules for determining the fatigue load are not specified in the overall standard, but are moved to detailed design standards: PN-EN 1992 to PN-EN 1999. Because of the high complexity of the fatigue verification, in the work the fatigue calculation rules only for concrete bridges are presented. Fatigue load models for both road and railway bridges, adequate combinations of actions and partial factors as well as rules of fatigue verification due to steel and concrete are discussed.