Experimental measurements of flanking transmission in CLT structures

This paper discusses the results of an experimental campaign that led to the characterization of flanking transmission in CLT structures with different connection systems. The vibration reduction indices Kij were measured in accordance with the ISO 10848-1 standard in order to provide data suitable to calculate the apparent reduction index according to the EN 12354-1 standard. The research explored several vertical and horizontal junctions on which different number and the type of screws and plates, different CLT panels, and resilient materials at the wall-floor junction were tested. The results show that the Kij along different transmission paths have a specific trends in frequency that depend on the fastening system and the mutual connection of the panels. Moreover, the analysis shows great discrepancies among measurements performed on CLT panels provided by different manufacturers. The results call for a deeper investigation concerning the mechanical/acoustical characterization of the panels.