PRESTRESS FORCE EFFECT ON VIBRATION FREQUENCY OF CONCRETE BRIDGES. DISCUSSIONS AND CLOSURE

Three discussions of a technical note with the aforementioned title by Saiidi, Douglas, and Feng, published in this journal (Volume 120, Number 7, July 1994), are presented. Discussers Dall'Asta and Dezi state that the effect of the prestress on the beam bending vibration frequencies is negligible and that expression (1) of the frequencies is not correct for the examined case concerning a prestressed beam. Discusser Deak, in the second discussion, states that no data is offered regarding the tendons of the bridge under investigation. In addition, calculations derived from expression (1) are believed to be erroneous. Deak offers an alternative to the authors' calculation and states that it is possible to check prestressing force by measuring the unit's natural frequency in a cracked state. In the final discussion, Jain and Goel disagree with the authors regarding the change in frequency due to "compression softening" effect of the prestress force. Discussions are followed by closure from the authors.

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  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Saiidi, M
    • Douglas, B
    • Feng, Shumin
  • Discussers:
    • Dall'Asta, A
    • Dezi, Luigino
    • Deak, G
    • JAIN, S K
    • Goel, S C
  • Publication Date: 1996-4

Language

  • English

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Filing Info

  • Accession Number: 00720435
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 18 1996 12:00AM