DISCUSSION ON AEROELASTIC DETAIL AND CONTROL IN THE FLUTTER OCCURRENCES OF LONG-SPAN BRIDGES

Considering the trend of longer-span bridges in future, aerostatic and aerodynamic features play a major role in their design. In this paper , the interaction between aeroelastic forces and structural response i s discussed along with the effects of structural countermeasures for f lutter instability of suspension bridges with spans longer than the Ak ashi Kaikyo Bridge of main span 1990 m. This analysis is conducted usi ng a newly developed direct FEM flutter analysis method and its assess ment system. To gain its aerodynamic stability effectively, the mode-s hape control concept is presented. Its effect is discussed quantitativ ely with examples as an interaction problem between aeroelastic force and structural response of longer-span bridges.