Comportement structural d'un platelage en aluminium sur poutre en acier : répartition transversale des charges

Authors: St-Gelais, Catherine
Advisor: Annan, Charles-DarwinFafard, Mario
Abstract: The use of aluminium decks in bridges has received attention in recent years, as the bridge engineering community discovers the advantages of this material compared with the traditional construction materials such as steel and concrete. Despite the recent introduction of Chapter 17 in the Canadian Highway Bridge Design Code, CAN/CSA S6, which permits engineers to use aluminium for bridge construction, the structural design application still remains a daunting task. Essentially, the code’s specifications for design do not provide concise and detailed methodologies for strength and serviceability verifications. As an example, for the simplified traffic load analysis, it appears that the factors for transverse distribution of traffic loads specified for aluminium bridge decks are based on values specified for wood plank decks, which appears insufficient. Another practical example relates to the determination of the plastic moment required to establish the bending moment capacity for the bridge section. Considering that a bridge deck solution in aluminium consists of a multi-cellular section made from extrusions, the application of the simplified method in determining the effective width of the deck section becomes a non-trivial task. A refined analysis using finite element methods is required to establish these design parameters for an optimized bridge solution in aluminium. In the present study, a finite element analysis is carried out to investigate the transverse distribution of traffic load on aluminium decks made from longitudinal and transverse extrusions, supported by steel girders. A number of bridge models are developed to study the influence of girder spacing and bridge span on the truck load fraction for aluminium decks and for establishing the effective area for the composite aluminium deck with steel girder system. It was determined that the code largely overestimates the values of truck load fractions, up to 25% to 40%. In addition, it was found that the truck load fractions calculated for models with transverse extrusion arrangements were always lower than those calculated for models with longitudinal extrusion. The transverse arrangement is therefore more effective in transferring truck loads to supporting girders. With respect to the effective area, the study showed that these values were lower for longitudinal extrusions than transverse extrusions. Finally, when compared with the values obtained using the simplified method by the code for a concrete deck, the effective areas determined were lower than those obtained from the code.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 16 February 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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