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Key Assumption to Evaluate the Mechanical Performance of Widened Voided-slab Bridge Due to Foundation Settlement
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Key Assumption to Evaluate the Mechanical Performance of Widened Voided-slab Bridge Due to Foundation Settlement
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Journal Article
Key Assumption to Evaluate the Mechanical Performance of Widened Voided-slab Bridge Due to Foundation Settlement
2018
Overview
In concrete bridge widening projects, it is a common practice to provide a monolithic connection between the existing and new decks by casting an in situ concrete stitching slab. As a result, the differential foundation settlement between the two decks has a considerable effect on the concrete stitching slab and the widened bridge. The widened bridge noted as multi-girder bridge is a simple-supported, precast, voided-slab bridge, located on the Beijing–Shanghai Expressway in east of China. When using a grillage Finite Element Model (FEM) to model the mechanical behavior of the multi-girder bridge after it has been widened, the general approach to account for the effect of differential foundation settlement is to load a calculated forced vertical displacement to the bearing of each precast slab of the new bridge. However, there is no suitable mathematical model to be used for calculating the forced displacement for all new slab beams, which requires the ability to describe the transverse distribution mode of these forced displacement under a given differential foundation settlement. Under this background, an experimental study and finite element analysis are conducted to find this suitable mathematical model in this paper. Based on a comprehensive research results, a quadratic curve model was considered to be a suitable mathematical model to meet the design need of such type of widened multi-girder bridge, and its quadratic equation was also derived in the paper. This finding is the key assumption for accurately analyzing the mechanical behavior of a widened multi-girder bridge, with a grillage finite element model.
Publisher
Korean Society of Civil Engineers,Springer Nature B.V,대한토목학회
