Free-stream Turbulence Effects on Long-span Bridge Aerodynamics

Historical view of long-span bridge aerodynamics

Some features of bridge aerodynamics of wind engineering are reviewed at this time, in view of the collapse of the Tacoma Narrows Bridge and also to celebrate Professor Alan G. Davenport’s 40 years of contribution to the field. Primary highlighted topics are: description of motion-dependent forces for flutter instability, presentation of gust responses caused by turbulent winds and suppression ...

Toward Better Understanding of Turbulence Effects on Bridge Aerodynamics

With the trend of variable cross-sections for long-span bridges from truss-stiffened to quasi-streamlined, and then to multiple-box cross-section geometries, the importance of aeroelastic performance is becoming increasingly significant in wind-resistant design. This article shows that there is clearly insufficient qualitative as well as quantitative understanding of turbulence effects on bridg...

The Effects of Turbulence on the Aerodynamics of Oscillating Prisms

This experimental study, focusing on the effects of turbulence on long-span bridge aerodynamics, examined the anatomy of turbulence effects on the self-excited forces responsible for flutter and the spanwise correlation of the overall aerodynamic lift and moment. This examination was conducted by measuring pressure distributions around an oscillating prism. A forcedvibration system was used wit...

Pushover Analysis of Long Span Bridge Bents

Effect of free-stream turbulence on boundary layer transition.

This paper is concerned with the transition to turbulence in flat plate boundary layers due to moderately high levels of free-stream turbulence. The turbulence is assumed to be generated by an (idealized) grid and matched asymptotic expansions are used to analyse the resulting flow over a finite thickness flat plate located in the downstream region. The characteristic Reynolds number Rλ based o...