Wind Effects on Bridge Structures
Guidance on wind effects on structure is predominantly limited to equivalent static loads with some additional provisions that acknowledge aerodynamic phenomena and their effects. AASHTO provisions include that aeroelastic phenomena of vortex excitation, galloping, flutter and divergence shall be considered where applicable, however, limited guidance is provided on these phenomena and where these effects may be consequential. This presentation will explore some of these aerodynamic phenomena - the mechanism, structural response, affected limit states and finally some guidance to circumvent/mitigate these effects in new/existing structures - through case studies. The presentation will discuss Vortex-induced vibration of cables and lightning poles, Rain-Wind induced vibration/Dry-cable galloping of stay cables and finally, “Torsional Flutter” of bridge decks (the collapsed Tacoma Narrows bridge) and some unsuspecting structures.
For more information and to RSVP, please email Eric Sanmarco at email@example.com