Approach for the mathematical calculation of the damping factor of railway bridges with ballasted track

A realistic prognosis of railway bridge vibrations during high-speed traffic must not only rely on the right choice of an adequate calculation model for both bridge and train but primarily on the use of dynamic model parameters which reflect reality appropriately. Concerning the damping characteristics of the used bridge model, the standard prescribes damping factors to be applied in calculations that are considered as lower bound values of the actual damping factors of bridges. Thus, measured damping factors often exceed normatively prescribed values significantly. This contribution presents a new approach, making the damping factor of railway bridges with ballasted track calculable. Comparing this approach, normatively prescribed and measured damping factors of existing bridges illustrates the apparent deviation between standard and measurement. It is also shown that this new approach provides results that are close to reality.

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