A full-depth precast deck employs a series of precast concrete panels that are full-depth in thickness—as required by structural design—with the length and width determined by specific bridge geometry. The length of the panel along the roadway is approximately 8 to 12 ft. The width of the panels is typically equal to the full width of the bridge. Both the length and width are determined on a basis of handling and transportation. Generally, speed and economy are achieved with the use of the least number of panels.

System Components

Transverse Design

The precast deck panel system is designed using the strip design method, where a transverse strip of the deck is analyzed as a continuous beam supported by the bridge girders. The girders are considered rigid supports with no settlement. The strip method concept results in providing the main reinforcement in the transverse direction of the deck.

Panel-to-Girder Connection

Deck panels can be connected to supporting girders using either composite or non-composite connections. Shear connectors should be capable of resisting both horizontal and vertical movement between the concrete and the supporting system.

PCI has issued a complete report with the appendices providing state-of-the-art guidance relative to selecting, designing, detailing, and constructing precast full-depth decks for bridge construction. The information is applicable for new bridge deck construction or bridge deck replacement.