橋梁構造断面の空力ガスト過渡応答特性に関する研究

Abstract

This study is concerned with the induced mechanism of torsional buffeting oscillation of thebasic structural H-shape section due to turbulent flow, which generally tends to generate typicaltorsional flutter phenomenum. The aerodynamic pitching moment for H-shaped cross section isalso measured in sinusoidally fluctuating flow to obtain the equivalent Kussner function experi-mentally. This function indicates fairly good agreement with the equivalent Wagner function asthe result of comparison of indicial response curves and of time history response analysis. Subse-quently the torsional buffeting characteristics can be said to be evaluated to large extent from thetorsional unsteady force characteristics in smooth flow.