Näherungsverfahren zur Beurteilung der Ermüdungsgefährdung von Hängern

Approximation method to evaluate the fatigue design of hangers.

A detailed investigation of the fatigue design of steel hangers in existing arch bridges usually requires extensive recalculations using 3D models of the complete structure and partial submodels of the hangers. As an alternative approach, an engineering assessment procedure has been developed to evaluate the affected bridges of the German waterways and shipping administration, to ensure standardised and economic treatment of this issue. It is based on approximate methods that make it possible to estimate the loads in round steel hangers and their connection areas under the influence of wind and traffic. Two of the approximation methods developed for this purpose - the determination of the natural frequency and of relevant bending stresses in hangers - are described below.