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TitleDynamic characteristics of Canada's Parliament Hill towers from ambient vibrations and recorded earthquake data
AuthorKolaj, M; Adams, JORCID logo
SourceCanadian Journal of Civil Engineering vol. 48, issue 1, 2020 p. 16-25,
Alt SeriesNatural Resources Canada, Contribution Series 20180093
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf; html
Lat/Long WENS -76.0000 -75.5000 45.5000 45.2500
SubjectsScience and Technology; earthquakes
Illustrationsphotographs; diagrams; tables; graphs
ProgramCanadian Hazard Information Service
Released2020 12 11
AbstractThe dynamic properties of Parliament Hill's buildings (Ottawa, Canada) are of particular interest due to their important heritage value and because of the seismic retrofit project currently underway. To measure the dynamic properties directly, ambient vibration data were collected within the Peace Tower of Centre Block and the South-West Tower of East Block and processed together with weak to strong ground motions from six earthquakes. Both datasets found the fundamental mode to be 1.0-1.15 Hz for the Peace Tower and 2 Hz for the South-West Tower. The 2010 magnitude 5 Val-des-Bois earthquake induced peak accelerations of 49% g and 18% g in the top floors of the Peace and South-West towers, respectively, triggering a nonlinear response, causing the frequencies of the dominant modes to be reduced by 10%-15%. The reduction in frequency was temporary and the frequencies returned to baseline values, suggesting that there was no permanent structural damage.
Summary(Plain Language Summary, not published)
To mitigate seismic risk it is important to obtain a structure¿s dynamic characteristics. Earthquake and ambient noise data recorded within the South-West and Peace Towers of Parliament Hill were processed to determine the Towers dynamic structural properties to varying amplitudes of input motions. These experimentally derived properties provide a useful dataset for validating computational models.

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