Abstract
Structure-borne sound transmission at a subfloor/joist connection typical of wood frame buildings is investigated experimentally and theoretically. The first part of this paper investigates the influence of the fastener spacing on the vibration attenuation across a joist. For this purpose, measurements were carried out on a small floor section for various coupling conditions of the joist. The experimental results suggested the existence of an effective coupling area characterizing the screwed joist/floor connection. In the second part of this study, a calculation model is developed based on Statistical Energy Analysis (SEA) and plate strip theory for the idealized case of a rigid line connection. The presented model is verified experimentally on a Plexiglas structure and a subfloor/joist connection. The experimental validation showed fair agreement between measured and calculated data, but revealed that more work is required to improve the prediction accuracy in realistic situations.
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