Key Assumption to Evaluate the Mechanical Performance of Widened Voided-slab Bridge Due to Foundation Settlement

다국어 초록 (Multilingual Abstract)

In concrete bridge widening projects, it is a common practice to provide a monolithic connection between the existing and newdecks by casting an in situ concrete stitching slab. As a result, the differential foundation settlement between the two decks has aconsiderable effect on the concrete stitching slab and the widened bridge. The widened bridge noted as multi-girder bridge is asimple-supported, precast, voided-slab bridge, located on the Beijing–Shanghai Expressway in east of China. When using a grillageFinite Element Model (FEM) to model the mechanical behavior of the multi-girder bridge after it has been widened, the generalapproach to account for the effect of differential foundation settlement is to load a calculated forced vertical displacement to thebearing of each precast slab of the new bridge. However, there is no suitable mathematical model to be used for calculating the forceddisplacement for all new slab beams, which requires the ability to describe the transverse distribution mode of these forceddisplacement under a given differential foundation settlement. Under this background, an experimental study and finite elementanalysis are conducted to find this suitable mathematical model in this paper. Based on a comprehensive research results, a quadraticcurve model was considered to be a suitable mathematical model to meet the design need of such type of widened multi-girderbridge, and its quadratic equation was also derived in the paper. This finding is the key assumption for accurately analyzing themechanical behavior of a widened multi-girder bridge, with a grillage finite element model.

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