2024 Volume 80 Issue 2 Article ID: 23-00164
Ito stochastic differential equations were applied to the torsional flutter analysis of a long span bridge, and Kármán-type spectra with turbulence intensity and turbulence scale as parameters were input to calculate the flutter critical wind speed as a random wind load force. The unsteady aerodynamic force coefficient (Flutter Derivatives) was measured in a wind tunnel in turbulent flow. The flutter critical wind speed varies depending on the combination of turbulence intensity and turbulence scale, but the result shows that the critical wind speed decreases when the turbulence intensity is large and the scale is large. Although the numerical results in this paper were obtained under limited conditions, they suggest the need for careful consideration of the wind resistance of bridge flutter.
