The flutter characteristics of long span bridges are discussed from the point of the unsteady pressure distribution on bridge deck surface during heaving/torsional vibration related to the aerodynamic derivatives. In particular, it is explained that the coupling terms, which consist of A1* and H3*, play a substantial role on the coupled flutter, in comparison with the flutter characteristics of various structural sections. Also the effect of the torsional/heaving frequency ratio of bridge structures on the flutter instability is discussed from the point of the coupling effect between heaving and torsional vibrations.
Key Words
flutter stabilization; a super-long span bridge; A1* or/and H3* control; unsteady pressure characteristics; two-separate box girders with a vertical plate.
Address
Department of Civil and Earth Resources Engineering, Kyoto University, Yoshida Hon-machi, Sakyo-ku, Kyoto, Japan
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