Making road traffic bridges silent
Tuesday 2 june, 2015, 10:40 - 11:00
0.2 Berlin (90)
The noise of road traffic bridges can be nuisance, especially nearby in the low frequency range. There are no noise regulations, but for new bridges and in case of renovation, the Dutch traffic authority wants to reduce the noise and construct a “Silent Bridge”. As a start of this project noise and vibration measurements were performed on a traffic bridge before and after the renovation of the steel bridge. Also a FEM BEM model of this bridge for and after renovation was build, to calculate the expected noise emission and for engineering towards a silent bridge. Comparing the FEM BEM calculations with the noise and vibration measurements lead to validation of the design process. The analyses lead to adjustments in the force excitation model used in the FEM-BEM approach and to a better prediction of the sound radiation. coefficient and adjusting this coefficient for further studies.. As a result of this study, more design tools can be given now to come to a silent traffic bridge. Engineering protocols for design, calculation and measurements were formulated to help other parties to build a silent steel bridge.
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