A time domain approach for predicting the coupled flutter and buffeting response of long span bridges is presented. The frequency dependent unsteady aerodynamic forces are represented by the convolution integrals involving the aerodynamic impulse function and structural motions or wind fluctuations. The aerodynamic impulse functions are derived from experimentally measured flutter derivatives, aerodynamic admittance functions, and spanwise coherence of aerodynamic forces using rational function approximations. A significant feature of the approach presented is that the frequency dependent characteristics of unsteady aerodynamic forces and the nonlinearities of both aerodynamic and structural origins can be modeled in the response analysis. The flutter and buffeting response of a long span suspension bridge is analyzed using the proposed time domain approach. The results show good agreement with those from the frequency domain analysis. The example used to demonstrate the proposed scheme focuses on the treatment of frequency dependent self-excited and buffeting force effects. Application to nonlinear effects will be addressed in a future publication.

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  • Supplemental Notes:
    • The support for this work was provided in part by the Kyoto University of Japan, National Science Foundation Grants CMS 9402196 and CMS 95-03779.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Chen, Xiaohong
    • Matsumoto, M
    • Kareem, A
  • Publication Date: 2000-1


  • English

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Filing Info

  • Accession Number: 00781816
  • Record Type: Publication
  • Contract Numbers: 59895410, CMS 9402196, CMS 95-03779
  • Files: TRIS
  • Created Date: Jan 26 2000 12:00AM