ABSTRACT

Abstract This paper describes the modelling of orthotropic steel bridges. The factors leading to the choice of model type are discussed, and particular emphasis is given to modelling of the orthotropic plate deck. An experimental load testing programme which was carried out on an orthotropic steel bridge in France is described. This involved driving two pre-weighed trucks across the bridge, a number of times, at different velocities. A three dimensional combined grillage and finite element model of the bridge was generated and analysed statically for the experimental truck loading. Comparisons are made between the predicted response of the bridge to the statically applied loading and the observed experimental response. The effect of truck velocity on bridge dynamics is highlighted and the paper concludes with some interesting observations relating dynamic amplification factors to truck velocity. Keywords: Bridge modelling, dynamic analysis, finite element analysis, instrumentation, natural frequency, orthotropic bridge decks, steel bridges.