Types of Bridges and their Suitability:
Bridging is a specialized filed of engineering science. It has very high degree of sill and expertise in this field, gathered from bridging its mighty rivers. The types of superstructure commonly adopted and the site conditions for which they are suitable are indicated in Table.
Table: Types of Bridges and their Suitability
A simple rule in determining the length of span of the super-structure of bridges is that the cost of the foundations and sub-structure should equal the cost of the superstructure. This is generally achieved by making the span length 1½ to 2 times the height of foundations plus the sub-structure.