構造基本断面の非定常空気力に関する研究

Abstract

Increasing of span length of suspension bridges, it has become more important how to evaluate the stability of flutter phenomina than before. Recent investigations have paid, in consequence, a lot of considerations on identification of aerodynamic derivatives.This study is concerned with identification of aerodynamic derivatives of structual sections of 2-D rectangler and truss girder sections.In order to identify them by wind tunnel tests, two different system identification methods, forced vibration method and free vibration method, are used. The result of identification of aerodynamic derivatives were mainly disscussed from the point of superposition of unsteady aerodynamic force corresponding to different mode.