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TitreDynamic characteristics of the west wing of East Block of Parliament Hill, Ottawa, Ontario from ambient noise recordings
TéléchargerTéléchargements
AuteurKolaj, M; Hunter, J; Adams, J
SourceCommission géologique du Canada, Dossier public 8308, 2018, 16 pages, https://doi.org/10.4095/306517
Année2018
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/306517
Mediaen ligne; numérique
Formatspdf
ProvinceOntario
SNRC31G/05
Lat/Long OENS -76.0000 -75.5000 45.5000 45.2500
Sujetsrisque sismique; risque de tremblement de terre; spectres d'amplitude; rapports spectraux; codes du bâtiment; analyse des déformations; Édifice patrimonial; Méthodologie; géophysique
Illustrationsphotographs; plans; schematic diagrams; spectra; tables
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeService d'information sur les dangers naturels au Canada, Service d'information sur les dangers naturels au Canada
Diffusé2018 02 06
Résumé(disponible en anglais seulement)
To mitigate seismic risk, it is important to obtain a structure's natural frequencies and resonant amplification spectra. To this effect, ambient seismic noise data were collected at three sites of interest as well as two reference sites within the west wing of East Block on Parliament Hill in Ottawa, Canada due to the importance and historic value of these heritage buildings. The data were processed using the standard spectral ratio (SSR) and horizontal-to-vertical spectral ratio (HVSR) techniques. Processing of the ambient noise data for the South-West Tower yielded approximately the same fundamental frequency (2.0 Hz) as did the analysis of the Mw 5.0 Val-des-Bois earthquake data (1.86 Hz). Several >3 Hz spectral peaks as well as broadband amplification (3 Hz - 8 Hz) were observed at room 219 and room 314 of the west wing at the locations of previously installed three-component earthquake accelerometers. The SSR technique was found to be more reliable than the HVSR technique in identifying the dominant peaks in the spectra. This was likely due to the presence of vertical amplification at the sites which is hypothesized to be caused by coupling between the horizontal vibrational modes with that of the floor which caused it to vibrate at a comparable frequency. An ambient noise survey such as the one performed in this work is a low-cost approach for documenting the dominant dynamic properties of a structure in the linear domain.
Résumé(Résumé en langage clair et simple, non publié)
Pour réduire les risques sismiques, il est important d'obtenir les caractéristiques dynamiques d'une structure. À cet effet, les données sur le bruit sismique ambiant ont été recueillies sur trois sites d'intérêt dans l'aile ouest de l'édifice de l'Est sur la Colline du Parlement à Ottawa, Canada, en raison de l'importance et de la valeur historique de ces bâtiments patrimoniaux. Un sondage sur le bruit ambiant tel que celui effectué dans ce travail est une solution économique pour documenter les propriétés dynamiques dominantes d'une structure.
GEOSCAN ID306517