BRIDGE CLASSIFICATION |
The types of bridges vary in total length, the length of their spans, and the weight they can support. Before deciding which kind to build at a particular place, engineers determine the length of the structure and of each span. They also consider the maximum load the bridge will carry and the materials available to construct it. Considering various aspects, bridges may be classified in the following ways :
1. Function or purpose to be performed :
Based on this bridges can be classified as an aqueduct over a river or a canal, a viaduct which may be road or railway over a valley, a pedestrian or a foot bridge, a highway bridge, a railway bridge, a road cum rail bridge, etc.
2. Construction material used :
Under this heading bridges can be grouped as timber bridges, masonry bridges, steel bridges, reinforced cement concrete bridges, pre-stressed bridges, composite bridges, etc.
3. Alignment of bridge :
Based on this bridges can be classified as a straight or a skew bridge.
4. Location of bridge floor relative to the superstructure :
In accordance with the relative position of bridge floor as compared to the superstructure, bridges can be classified as deck, through, semi-through and suspended bridge.
5. According to the type of superstructure :
Depending upon the type of superstructure, bridges can be grouped as slab, girder, truss, suspension, cable stayed, arch, drawbridges,etc.
6. Nature of superstructure action :
Under its category bridges can be classified as portal frame bridges, truss bridges, balanced cantilever bridges and suspension bridges.
7. Location of Highest Flood Level :
Particularly for a highway bridge, under this category bridges may be classified as a high level or non - submersible bridge and a submersible bridge depending upon the formation level of the bridge relative to the highest flood level.
8. Fixed or Movable / Method of clearance for navigation :