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The main purpose of the present paper is to compare two different kinds ofapproaches in modeling the deck of a suspension bridge: in the first approachwe look at the deck as a rectangular plate and in the second one we look at thedeck as a beam for vertical deflections and as a rod for torsionaldeformations. Throughout this paper we will refer to the model corresponding tothe second approach as the \textit{beam-rod model}. In our discussion, weobserve that the beam-rod model has more \textit{degrees of freedom} ifcompared with the isotropic plate model. For this reason the beam-rod model issupposed to be more appropiate to describe the behavior of the deck of a realsuspension bridge. A possible strategy to make the plate model more efficientcould be to relax the isotropy condition with a more general condition oforthotropy, which is expected to increase the degrees of freedom in view of thelarger number of elastic parameters. In this new setting, a comparison betweenthe two approaches becomes now possible.  Basic results are proved for the suggested problem, from existence anduniqueness of solutions to spectral properties. We suggest realistic values forthe elastic parameters thus obtaining with both approaches similar responses inthe static and dynamic behavior of the deck. This can be considered as apreliminary article since many work has still to be done with the perspectiveof formulating models for a complete suspension bridge which take into accountnot only the deck but also the action on it of cables and hangers. With thisperspective, a section is devoted to possible future developments.

An orthotropic plate model for decks of suspension bridges