Bluff な構造断面の空力不安定振動特性と防振対策に関する研究

Abstract

This study is concerned with the vortex-induced oscillation and galloping of bluff bodies.For some basic cross sections the mechanisms of vortex-induced oscillations was classifiedto three different types by the characteristics of velocity fluctuations in wake in relation tothe occurrence of vortex-induced oscillations. Furthermore the effect of mass-damping para-meter and some attachments like deflector on the responsive amplitude of vortex-inducedoscillations was investigated for cable-stayed bridge deck sections. On the othet hand theproperties of galloping oscillation were examined for some bluff sections and some commentsof applicability of quasi-steady theory to galloping oscillation were briefly shown.