The bridge structural components in general can be divided into three basic components:
Deck is part of the bridge structures that directly carry the vehicle load and/or pedestrian load. Depending on the type of the bridge, the deck can be made of concrete, steel, timber or combination of them. The deck itself is supported by superstructure. The bridge superstructure can be in the form of bridge girder, steel trusses, cable-stayed system, cable-suspended system etc. The superstructure is supported by substructure such as bent, pier, abutment and foundation.
These are the most common structural components of bridge structures. There are some variation from this such as a bridge called slab bridge that consist only slab/deck and substructure. This type of bridge is normally used for short span bridges.