Traditional and operational modal testing of the Washington National Cathedral

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

This paper investigates differences between traditional and operational modal analysis as applied to a masonry-vaulted structure. For this purpose, we applied the techniques of both traditional and operational modal analyses to the choir fan vaults of the Washington National Cathedral (D.C.), a monumental church of Indiana limestone, vaulted in the 1930's in the Gothic style. Impact hammer excitation was used during traditional modal analyses tests, while five different excitation sources: (1.) peal bells, (2.) carillon bells, (3.) orchestra and chorus, (4.) organ, (5.) ambient, were used during operational modal analyses tests. The first four types of excitations were measured by a microphone. The acoustic input of these excitations, especially the carillon and the orchestra/chorus, was found to approximate a uniform distribution across the bandwidth of interest. System identification was completed by the least squares complex exponential (LSCE) method. In general, the most pronounced of the identified natural frequencies were found to be in agreement for all excitation sources. Certain natural frequencies found by traditional modal analysis, however, were omitted from the sequence of frequencies determined by operational modal analysis.

Original languageEnglish (US)
Title of host publicationProceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007
PublisherAalborg University
ISBN (Print)9788791606144
StatePublished - Jan 1 2007
Event2nd International Operational Modal Analysis Conference, IOMAC 2007 - Copenhagen, Denmark
Duration: Apr 30 2007May 2 2007

Publication series

NameProceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007

Other

Other2nd International Operational Modal Analysis Conference, IOMAC 2007
CountryDenmark
CityCopenhagen
Period4/30/075/2/07

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Mechanical Engineering
  • Safety, Risk, Reliability and Quality

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  • Cite this

    Atamturktur, S., Fanning, P., & Boothby, T. E. (2007). Traditional and operational modal testing of the Washington National Cathedral. In Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007 (Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007). Aalborg University.