Attenuation of structure-borne vibrations induced by trains passing railway switches
Sammanfattning: The study of structure-borne vibrations caused by railway traffic is becoming increasingly relevant along with the expansions of cities, as building projects are forced towards more sensitive areas, e.g closer to railway tracks. With high enough vibration levels, there is a risk for human annoyance inside buildings. Knowledge of the attenuation of vibrations in the ground caused by railway traffic is in such cases of great importance. Where a railway switch is present, higher levels are likely to be generated as the train passes. In this study, measurements of vibrations from railway traffic as trains pass a railway switch was performed. Four accelerometers were placed at different distances away from the track to capture the attenuation. In the analysis of the measurements, the attenuation of train induced vibrations and the dominating response due to the presence of the railway switch is found. From the findings in the measurements, a model based on superpositioning of incoming waves from point sources is developed, that predicts the attenuation of vibrations over distance from a train passing over a railway switch.
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