Abstract
This paper presents results from experimental testing of a railway bridge. Forced vibration tests was performed using a hydraulic actuator with variable load amplitude. The estimated modal properties show that the increased load amplitude results in lower natural frequency and higher damping, especially for the first mode of vibration. Despite this, even at relatively large amplitude of vibration the estimated damping is lower than proposed by Eurocode EN 1991–2. A simple 2D model is presented that shows good agreement with the experimental results, both regarding natural frequencies, mode shapes and the response from passing trains.
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