ABSTRACT
Bridges are built in a specific sequence, generally based on structural and site considerations. Typically built first is the substructure of the bridge, which transfers the weight of the bridge into the ground. The substructure usually consists of vertical columns, or piers, and abutments, which are the structures connecting the end of the bridge to the ground. The superstructure is generally built next, and consists of the main deck of the bridge, which typically spans between the prebuilt piers.
