Analysis of the Shear Lag Effect in Composite Bridges with Complex Static Schemes by means of a Deck Finite Element

This paper presents the derivation of a finite element formulation for the analysis of composite decks accounting for partial interaction theory and shear-lag effects. The particularity of the proposed element, referred to as the deck finite element, relies on its ability to capture the structural response of complex static schemes, such as those specified for arch, bow-string and cable stayed bridges, while preserving the ease of use of a typical line element. For these particular bridge Solutions, stress concentrations may be induced in the slab by the application of concentrated forces, i.e. due to the anchorage of prestressing cables or stays, or due to the presence of web members in arch bridges. The ease Of use of the proposed deck finite element is Outlined considering two case Studies for which the calculated results have been compared against those obtained using a more refined model implemented using shell elements in a commercial finite element software.