System Identification and Displacement Profiles of Multi-Span Skewed Bridges with Seat Type Abutments

  • Seku CatacoliEmail author
  • Carlos E. Ventura
  • Steve McDonald
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


Skewed bridges are classified as irregular structures due to the geometry of the deck and bents. The evaluation of their dynamic response is challenging as it requires a combination of several modes of vibration. In this study, the results of ambient vibration tests performed on four bridges in British Columbia, Canada are used to identify the dynamic properties and the displacement profiles of multi-span skewed bridges with seat type abutments. The frequencies of vibration, the modes of vibrations and the modal dampings are identified using frequency and time domain techniques. In addition, the directionality in the transverse and longitudinal response for skewed bridges with different levels of lateral restraint and deck flexibility is discussed. This paper improves the understanding of the dynamic response of skewed bridges, in particular their lateral response to seismic loads. This understanding contributes to having a better assessment of the seismic demands that skewed structures will undergo and to the development of displacement based design methods for these structures.


Skewed bridges Ambient vibration tests Displacement profiles Seat type abutments 



This study was conducted with financial support from the Ministry of Transportation of British Columbia, Canada and the Natural Sciences and Engineering Research Council of Canada. Support provided by Professor Albert Ortiz from University of Medellin and the field testing team from the University of British Columbia is acknowledged with thanks.


  1. 1.
    American Association of State Highway and Transportation Officials (AASHTO) (2009) Guide specifications for LRFD seismic bridge design. AASHTOGoogle Scholar
  2. 2.
    Stewart JP et al (2011) Representation of bidirectional ground motions for design spectra in building codes. Earthquake Spectra 27(3):927–937CrossRefGoogle Scholar
  3. 3.
    Catacoli S, Ventura C, McDonald S (2012) Directionality in the transverse response of skewed multi-span bridges with integral abutments. In: Proceedings of the 30th IMAC, a conference on structural dynamics, doi:  10.1007/978-1-4614-2413-0. Topics on the Dynamics of Civil Structures, Volume 1 Conference Proceedings of the Society for Experimental Mechanics Series 2012, pp 139–143
  4. 4.
    Carvajal JC, Ventura CE, Huffman S (2009) Ambient vibration testing of multi-span bridges with integral deck-abutments. In: Proceedings of the IMAC-XXVII. February 9–12, 2009, OrlandoGoogle Scholar
  5. 5.
    Maleki S (2001) Free vibration of skew bridges. J Vib Control 7:935–52zbMATHCrossRefGoogle Scholar
  6. 6.
    Srinivasan RS, Munaswamy K (1978) Dynamic response of skew bridge decks. Earthquake Eng Struct Dyn 6:139–56CrossRefGoogle Scholar
  7. 7.
    Ghobarah AA (1974) Seismic analysis of skewed highway bridges with intermediate supports. Earthquake Eng Struct Dyn 2(3):235–40CrossRefGoogle Scholar
  8. 8.
    Artemis Extractor Software (1999–2011) Structural vibrations solutions, vol 5.3. Artemis Extractor Software, DenmarkGoogle Scholar
  9. 9.
    TurekM, Ventura C (2005) Vibration testing of the Deltaport way bridge. In: Proceedings of the IMAC-XXIII, Orlando, January 31–February 3, 2005Google Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2013

Authors and Affiliations

  • Seku Catacoli
    • 1
    Email author
  • Carlos E. Ventura
    • 1
  • Steve McDonald
    • 1
  1. 1.Civil Engineering DepartmentUniversity of British ColumbiaVancouverCanada

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