Abstract Summary
Aerodynamic derivatives are widely used to model the self-excited forces on bridges and for estimating the corresponding flutter stability. It is currently unclear to which degree the aerodynamic derivatives of a cross section depend on the presence of turbulence in a flow, however it is believed to depend on the cross section. Wind tunnel experiments were conducted with forced vibration testing to investigate whether aerodynamic derivatives for a twin deck cross section changed with increasing turbulence and whether longer measurement periods would yield less uncertainty in the data. Numerical simulations were run to investigate the uncertainty of aerodynamic derivatives related to turbulence and length of measurement period. It was shown the uncertainty of the aerodynamic derivatives decrease for longer measurement periods and less turbulence.
