Comportement dynamique des ponts à platelage d'aluminium extrudé sous l'effet des surcharges routières
|Advisor:||Annan, Charles-Darwin; Dey, Pampa|
|Abstract:||Aluminium is a material of choice for any highway bridge owners looking for more durable materials. Combining an excellent strength to weight ratio with an excellent corrosion resistance, an extruded aluminium deck connected to steel girders provides a lighter structure and requires less maintenance than the usual materials, such as steel or concrete. However, the aluminium’s lightweight, which is a huge advantage for the foundations design as well as for the construction, can become a concern when the bridge’s dynamic behavior is considered, due to its higher vibration frequencies. Considering that the Canadian Highway Bridge Design Code prescribes the use of a dynamic load allowance (DLA) factor to account for the dynamic effects of the traffic loads on the bridge, and that the values prescribed are based on the dynamic behavior of traditional bridges, some doubts arose about the applicability of this coefficient to aluminium deck bridges, which are expected to have a different dynamic behavior. To validate these speculations, simplified dynamic models were developed to replicate the dynamic behavior of two Canadian trucks, the CL-625 and the train double B. These models were then implemented in Abaqus and used in a series of dynamic analysis investigating the effect on the bridge response of different parameters, both from the truck and the bridge. Results have shown that, despite having a different dynamic behavior, the dynamic amplifications observed on aluminium deck bridges were always lower than the DLA values prescribed by the Canadian code, indicating that, for the situations studied, those values are safe to use. However, further studies will be required before any final conclusions can be made about the applicability of the DLA values in their current state.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||13 March 2020|
|Collection:||Thèses et mémoires|
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