Long-term extreme response of a long-span bridge accounting for parametric effects of wind turbulence: part II – analyses and results

This study extends the long-term extreme response analysis to incorporate turbulence-induced parametric effects, which influence the aerodynamic damping and stiffness of suspension bridges depending on its aerodynamics and environmental wind conditions. The methodology, introduced in Part I, is applied to the Halsafjorden Bridge, a planned 2000-m main-span suspension bridge in Norway. Using a frequency-domain approach, turbulence-induced variations in the angle of attack are efficiently integrated into the long-term response framework. This method enables feasible long-term calculations for various random environmental parameters. The results compare long- term predictions with classical Davenport’s short-term approach, which are not very different in this specific case study. However, the role of highlighted by the parametric effects under different turbulence conditions appears to be significant, suggesting the need for further investigation in the future.