長大吊橋の不規則な耐風応答特性に関する研究

Abstract

On the aeroelastic response of long-spanned suspension bridges due to the random gust, afew kinds of model tests are performed in turbulent shear flow generated in the wind tunnel. Inturbulent flow comparatively large oscillations are observed for low wind speed region below thecritical flutter velocity. The power spectrum of this response is in good agreement with thetheoretical predictions, obtained by the modified quasi-steady theory in which the dynamic effects ofstructures are considered. Besides, as its applications to real structures, some numerical evaluationsare made for estimating the aerodynamic random response of Honsho-Shikoko connecting suspen-sion Bridge (Akashi Strait Bridge) due to the random gust.