Environmental Noise And Vibration Control Of The Rose Theatre, Brampton, Ontario

The Rose Theatre in Brampton, Ontario was to be constructed twenty meters away from a CN main railway line (which includes commuter and freight rail traffic) and on top of a pre-existing underground parking garage which was to remain intact and in operation during the course of construction. A full concrete slab could not be supported by the pre-existing parking garage columns; therefore, a transfer grid, designed by the structural engineer, was employed and as a result a typical "room-within-a-room" construction could not be conventionally achieved. Railway airborne noise is controlled to meet the interior objective of RC 20 by providing a "floating" shell enveloping the entire building. Exterior concrete pre-cast panels are resiliency supported and resiliency connected back to the building and the entire roof slab was vibration isolated from the structure. For railway-induced vibration, the building was supported on a transfer grid which was in turn supported by 250 mm thick rubber vibration isolation pads. The entire building, including exterior shell, stairs and elevators is vibration isolated from ground-borne rail vibration. The measured vibration levels (and the noise radiated by vibrating surfaces) in the theatre were controlled to well within the design objective.Original Abstract: Le theatre Rose de Brampton devait etre construit a vingt metres d'une voie principale du CN (sur laquelle circulent trains de marchendises et trains de voyageurs) et en aplomb d'un parking souterrain pre-existant devrant rester intact et operationnel durant toutes les etapes de la construction. Il etait impossible de faire supporter une large chape de beton par les colonnes du garage pre-existant, il a done fallu que l'ingenieur concoive une grille de transfert si bien que construire une "piece au sein d'une autre" sur la modele conventionnel ne pouvait etre envisage. Les bruits ambiants provenants de la voie ferree sont maitrises a l'aide d'un "bouclier flottant" enveloppant tout l'edifice en vue de respecter un objectif interieure de RC-20. Les panneaux exterieurs en beton prefabrique sont montes sur supports isolants et connectes au batiment par isolants. La dale du toit a ete isolee de toute vibration de la structure. En ce qui concerne les vibrations provenant du chemin de fer, l'edifice prend appui sur une grille de transfert elle-meme s'appuyant sur des tampons de vibration en caoutchouc de 250mm d'epaisseur. Tout l'edifice, envelope exterieure, escaliers et asc