吊橋トラス補剛桁の空力不規則曲げ捩れ応答に関する研究

Abstract

This paper presents the method of flexural-torsional response characteristics of stiffeninggirder of suspension bridge subjected to randomly fluctuating gusty wind. The flexual-tor-sional response of stiffening girder is numerically calculated in course of time, based ondata of fluctuating wind velocities, to evaluate the power spectral densities by convertingthe time-history of response. The results obtained by this indirect method accord with theexperimental results, while the results obtained by the customary method, namely thedirect method, tend to overestimate the frequency dependent response characteristics. Inconnection with the above method of analysis, the transfer lift function, viz. the frequencydependent relation between lift force and wind velocity, is studied by the wind tunnel testsfor a few typical structural cross section.