Datum: 2008-08-10
Kurzfassung: Over recent decades the cruising speed of rail traffic has increased considerably within Europe. At the same time a trend towards higher axle loads is recognizable as well. Apart from the technological developments achieved in the field of high-speed and freight trains, several measures have been required on the railway track. An alignment with large curve radius and proper superelevation is required in addition to sufficient long and short-term stability of the superstructure, especially regarding high dynamic loads. Whereas these requirements are usually met on the free track, on railway bridges resonance effects may cause serious problems in terms of dynamic response. From a static point of view, only the bridges are the bottle-neck and limiting factor for operation of higher axle loads. Triggered by these aspects, a specific chapter in Eurocode 1 is dedicated to dynamic calculations of railway bridges and several guidelines cover recalculations of bridges subjedted to increased life loads. This paper summarises current knowledge of the authors derived from field investigations of bridges concerning the described problems.
Keywords: Railway bridges, certification, dynamics, measurements, historic structures, bridge upgrade
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