橋梁の空力振動 [in Japanese] BRIDGE AERODYNAMICS [in Japanese]
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This paper describes the aerodynamic properties and their generation mechanism of various wind-induced vibration of bridge structures, based on the recent investigations. For vortex-induced vibration, two different kinds of vortices, which are related to the instability of one/two shear layer (s) respectively, play major role. Furthermore, the intermittent Karman vortex shedding can excite the inclined circular cylinder at much higher reduced velocity than the reciprocal of Strouhal number, so called "high speed vortex-induced vibration". Galloping instability is caused by the unsteady flow for bluff section and the quasi-steady flow for slender section, corresponding to "low speed galloping" and "high speed galloping", respectively. On the other hand, it is shown that the torsional flutter instability is fundamentally identical to the coupled flutter instability from the point of flow pattern / unsteady pressure distribution characteristics around the body based on non-dimensional chordwise coordinate which is normalized by the body height. Finally the aerodynamic stabilization of these wind-induced vibration is briefly discussed.
nagare 14(3), 209-225, 1995-06-30
The Japan Society of Fluid Mechanics