A common construction technique for multi-story buildings is to build walls of hollow concrete block masonry which are rigidly connected to floors of precast prestressed concrete hollow core slabs. The airborne flanking transmission for buildings of this construction must be determined to predict the apparent sound transmission class to meet the requirements of the National Building Code of Canada. Ideally, this would be done using the prediction method and the vibration reduction index values found in the standard, ISO 15712. However, prior studies conducted at the National Research Council Canada have shown that the hollow core slabs are neither homogeneous nor isotropic which are the requirements for predicting the values of the vibration reduction index (Kij) according to Annex E of the standard ISO 15712. To determine if the theoretical values of the vibration reduction index could nonetheless be applied in practice, an experimental investigation was performed on full scale junctions between concrete block masonry walls and precast concrete hollow core floors built and tested in full compliance with the standard ISO 10848. The investigation found that conservative vibration reduction index values could be predicted using Annex E of ISO 15712.
The estimate of the resonant sound reduction index has received attention over the years as the prediction method described in the standard, ISO 15712 has been applied to lightweight building constructions. A method of estimating the resonant sound reduction index involves the measurement of the total and the resonant radiation efficiencies of the building elements involved in the first order flanking paths. The radiation efficiencies of different lightweight wall constructions were evaluated as part of a study conducted at the National Research Council Canada are presented. The study focused on the measurement of the radiation efficiencies with the aim of developing guidelines for the measurements. Predicted values of the flanking transmission loss for each flanking path are compared to data which was measured in the National Research Council's eight room flanking facility.
The ISO 15712 series of standards describe a method of predicting the flanking transmission in homogeneous isotropic building constructions. Since the method was first published in 1979, there has been great interest in applying the prediction method to lightweight constructions which are neither isotropic nor homogeneous. The prediction method becomes more complicated for lightweight constructions because the resonant sound reduction indices of the elements must be estimated from measurement data including the sound reduction indices and the resonant and total radiation efficiencies. However, there is the question of which sound reduction index and radiation efficiencies should be used. Should they be for the whole wall or a single panel? Results from a study conducted at the National Research Council Canada are presented. Predicted values of the flanking transmission loss for each flanking path are compared to data which was measured in the National Research Council's eight room flanking facility.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.