Time Domain Flutter and Buffeting Response Analysis of Bridges
Publication: Journal of Engineering Mechanics
Volume 126, Issue 1
Abstract
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 here 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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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 126 • Issue 1 • January 2000
Pages: 7 - 16
History
Received: May 24, 1999
Published online: Jan 1, 2000
Published in print: Jan 2000
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