Deck (bridge)
Structural Analysis:
– Beam deck: deck and supporting structure act as a single beam
– Grid deck: uses beams and diaphragms as supporting structure
– Slab deck: deck analyzed as a plate, may be orthotropic
– Beam and slab deck: beams may deflect independently, transverse forces carried in deck
– Cellular deck: thin slabs and webs enclose cells within deck, boxgirder deck forms top of box girder during analysis
Railway Bridge Decks:
– Open deck: track and ties supported on load-carrying elements of superstructure
– Ballasted deck: track rests on ballast carried by bridge superstructure
– Direct fixation: rails anchored directly to bridge superstructure
See Also:
– Bridge: visual index of various bridge types
– Bridge bearing
– Freeway lid
– Orthotropic deck
– Roadbed types
References:
– Members of a Truss Bridge, by Benj. F. La Rue
– Bridge Deck Behaviour by E. C. Hambly
– Railroad Bridges in Bridge Engineering Handbook by Donald F. Sorgenfrei and W.N. Marianos
External Links:
– Composite Bridge Decking: Final Project Report by Federal Highway Administration
– Authority control databases: National Israel United States
A deck is the surface of a bridge. A structural element of its superstructure, it may be constructed of concrete, steel, open grating, or wood. Sometimes the deck is covered by a railroad bed and track, asphalt concrete, or other form of pavement for ease of vehicle crossing. A concrete deck may be an integral part of the bridge structure (T-beam or double tee structure) or it may be supported with I-beams or steel girders.
When a bridge deck is installed in a through truss, it is sometimes called a floor system. A suspended bridge deck will be suspended from the main structural elements on a suspension or arch bridge. On some bridges, such as a tied-arch or a cable-stayed, the deck is a primary structural element, carrying tension or compression to support the span.
A deck bridge is one in which the deck itself is the main structural element, itself carrying the roadway. Contrast to a truss bridge which may carry a deck on the top chords or bottom chords of a structural truss.