Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux

Type de document

RAPPORT DE RECHERCHE

Langue

anglais

Auteur

BEN MEKKI ; TOUTLEMONDE ; CARON

Résumé / Abstract

The present study is focused on short span bridges and in particular small industrial light structures easy to assemble on site, and likely to be used alone for smallest spans or themselves supported by structural elements, when used transversally, for most important spans. This comes from the prospective vision of trends and wishes concerning bridge construction in the next decades, as developed in D3.1. The main idea of the designs studied in D3.3 is to combine new attractive materials, using the best performances of each material as detailed in D3.2 [20], including the possible use of a traditional material such as the wood, due to its attractive properties regarding lightness and environment. The element of bridge deck considered is formed by wooden beams, a top slab made of UHPFRC, and FRP at the bottom of the wooden beams, as considered in preliminary design (see D3.3). The objective was to study a very innovative structure, taking into account possibilities offered by new materials and the advantage of wood, for wich advantages in terms of sustainability give a renewed interest. This type of solutions raises the problem of assemblies: assemblies of FRP with wood, and assemblies of wooden beams with concrete slabs, and above all, the problem if the choice of the assemblies type and its execution mode. The behaviour of assemblies is critically related to the transfer of forces from a material to the other one. It has a direct influence on the global behaviour of the structure composed by these materials, and on the way it shall be modelled. As detailed in specific reports, important preliminary research efforts were carried out at ENPC-LAMI for assessing the respective advantages and drawbacks of different types of connection, especially between wooden members and concrete, and their influence on the design issues of composite structures [16, 17]. These advances were used in the present project for giving confidence in the feasibility of mainly adhesive connections. However, due to the lack of quantified evidence on realsizee structures, the innovative design needed an experimental validation using a laboratory test on a structural element. This element of structure, that will be detailed in the next paragraphs, has been studied and designed by JMI, Greisch, LCPC and has been constructed and tested by the LCPC. Drawings of the specimen and design justification, issued by Greisch engineering office, are attached as Appendix A and Appendix B of the present report, respectively., RAPPORT DE CONTRAT