A Study of Structural Parameters Affecting Flutter Stablility of Suspension Bridges

[摘要] The cable suspended bridges have been used woldwide to connect two remote points, separated usually by water. These bridges may be largely affected by wind because of the sites where they are erected, being usually near estuaries, their large proportions and their particularly flexible design because of the cables involvement in the overall stiffness of the bridge. In the present work a parametric analysis is carried out of the basic structural properties of the cable suspended bridge and the effects of these properties on the flutter stability of the bridge are investigated. In the present work two numerical approaches were used being available with the computer program 'ANSUSP'. The natural modes were firstly computed for a cable suspended bridge with the severn bridge nominal structural properties and for each modified bridge configuration and an effort was made to explain the effects of the alteration of the structural properties on the aero-elastic behaviour of the bridge. Modal analysis method was used for a wide variety of bridge structural properties and critical windspeeds were predicted. Secondly the time history method was used only for some selected bridge structural properties, being the more time consuming method of the two and flutter speeds were predicted. The results of the two methods are presented in graphs and are compared between each other and also with the results of selberg's semi-empirical equation.

[发布机构] University:University of Glasgow

[关键词] Civil engineering