Bewertung von bestehenden Brücken hinsichtlich Schiffsanprall

Evaluation of existing bridges concerning ship impact

Existing bridges have sometimes to be evaluated considering ship impact. Using present codes for accidental actions would often lead to rehabilitation measures or to new structures which might not be efficient regarding the rareness of serious ship collision events to bridges. Therefore a method has been developed to determine ship collision forces as time-dependent action for the remaining lifetime of an existing bridge. This method, called remaining life expectancy concept, is based on the design concept of DIN EN 1990 which is a reliability-based design procedure. It considers the principles of the common maintenance strategies and allows the safe and economic verification of existing bridges considering their experienced lifetime. The contribution explains the probabilistic methodology of modern ship impact determination by combining a load model with a collision model as it is used for the design of new bridges. The adaption to remaining lifetime adapted dynamic impact forces is shown. The method has been published in 2010 as a guideline by Bundesanstalt für Wasserbau.