Prestressed Decks in Continuous Composite Bridges

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Abstract
A convergent series solution, using the concept of equivalent orthotropy, is employed to analyze continuous composite bridges under static loads. The effect of the interaction between prestressing a portion of the deck slab and shear connectors in the region of the intermediate supports is examined. It is shown that prestressing the deck slab increases substantially the cracking load as well as the stiffness of such bridges. Results from tests on two bridge models verify and substantiate the theoretical analysis.

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