Noise prediction of a steel-concrete railway bridge using a FEM
Wednesday 3 june, 2015, 14:20 - 14:40
0.1 London (90)
In order to expand the motorway A1 the existing concrete railway bridge of the line Amsterdam-Almere has to be replaced. To predict the noise of the trains on the bridge, vibration calculations were conducted with a finite element method (FEM). In order to calibrate the simulations, noise and vibrations measurements from a similar steel-concrete railway bridge were used to validate a FEM model of the reference bridge. To meet the noise requirements the new bridge design has been optimized, based on the measurements and calibrated calculations of the reference bridge. In order to achieve the maximum amount of space for the layout of the motorway, a single span bridge is required. The bridge is situated near dwellings. According to the noise requirements set by the legislator the noise of the trains on the bridge has to be equal to or lower than the noise of the trains on a standard railway track. Due to the large span and strict noise requirements a steel-concrete bridge design was chosen, consisting of steel girders and arches and a concrete deck. The rails are fastened on concrete sleepers resting on track ballast. Between the concrete slab and the ballast layer a so called ballast mat is located in order to decouple the train induced vibrations from the concrete deck.
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