鉛直板付き分離箱桁のフラッター特性

概要

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Since flutter phenomenon is catastrophic oscillation, its stabilization is very important problem in the design of long span bridge girders. The flutter characteristics are discussed from the unsteady pressure distribution on bridge deck surface under heaving/torsional vibration. In this research wind tunnel tests are carried out for separated box girders with the triangle fairings and the vertical plate to improve flutter instability of long span bridge girders. The results shows attachment of the triangle fairings and the vertical plate is effective for reduction of the key aerodynamic derivative A1* and H3*. From the unsteady pressure measurement and flow field around the girders under the heaving/torsional 1DOF forced vibration, it is revealed that this is brought by the phase control by the installation of vertical plate.
一般社団法人日本風工学会の論文