Title:
Assessing The Strength Of RC Beam-and-Slab Bridge Decks Using Compressive Membrane Action
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Publication:
CIA
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DOI:
Date:
2/13/2011
Abstract:
When using flexural theory, the strength of a reinforced concrete beam-and-slab bridge deck is commonly underestimated. One of the reasons for this is that compressive membrane action often exists in the deck slabs of these bridges but is not considered when assessing their strength. Compressive membrane action exists due to the formation of cracks in the concrete and the presence of horizontal end restraints on the slab. Its existence can result in the slab having a much higher strength and stiffness than that determined using flexural theory. Approximate methods to account for compressive membrane action have been developed by previous researchers. These methods require knowledge of the restraint stiffness that exists in the slab, and this is not known with much certainty. Hence, compressive membrane action is usually not taken into account when determining the strength of reinforced concrete slabs. This paper describes a design method for assessing the restraint stiffness that exists in the slab of typical beam-and-slab bridge decks.