With respect to a given excitation e.g. by the standard tapping machine, vibrating stairs can be treated as sources of structure-borne sound. To improve the impact sound insulation heavy stairs are usually decoupled from the building using resilient supports. In many countries in Europe (e.g. in Germany) this is actually required to meet legal requirements. However, at present there are no standard procedures available neither for measurement in the laboratory nor for the prediction of the impact sound transmission in buildings. Investigations on decoupled stairs and landings have been carried out in a building-like staircase test facility in order to identify and quantify the parameters that are relevant for the sound transmission. It could be shown that the modal behavior of the stair components and the characteristics of resilient elements with respect to the static load have to be considered. Based on the results a standard test method is proposed that gives data that can be used to predict the sound transmission in buildings using EN 12354-2.
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