Bridges

Written by | Sunny Raza

A bridge is a structure to cross river and other natural obstacles from one point to another point.

In bridges designing hydraulic study is important while in fly over it is not important. This is the difference between flyover and bridges. Hydraulics study means the study of water flow, water depth in the maximum capacity and its velocity of flow. In flyover designing we consider the maximum clear height of the vehicles.

 

 

Types and classification

A bridge is classified into following types. There are as follows

• Beam Bridges
• Cantilever Bridges
• Masonry Arch Bridges
• Suspension Bridges
• Cables stayed Bridges
• RCC Bridges
• PC Prestress concrete Bridges
• Composite Bridges

Beam Bridges

Beam bridges are the simplest type of bridge. It is made up of two or column or support more which holds the beam.

Cantilever Bridges

In cantilever bridge two beams is support another beam which is where the deck or traffic way is.

Masonry Bridges

An arch bridge is a bridge with abutments at each end shaped as a curved arch.

Suspension Bridges

A suspension bridge is a type of bridge whose girders are hung from the main cables, stretched between anchorage to anchorage, and the cables are hung from the towers. Suspension bridges do not need piers in the middle, because the girders are supported by the cables. This structure enables the bridge span length to be longer than that of other types of bridge. It is consider for the span of 100 meters.

RCC Bridges

In RCC Bridge the span is consider to be 12 to 15 meters.

PC Prestress Concrete Bridges

There are two types of PC prestress concrete bridges.

• I-Girders
• Box Girders

Composite Bridges

A composite bridge is a type of bridge combining different types of materials, mainly steel and concrete.

Types of composite bridges

• Truss bridges
• Plate girders

Cables Stay Bridges

A cable stay bridges is a type of bridge whose girders are supported by inclined cables hung from the towers. With the support of a hanging structure, cable stayed bridges can span longer distances compared with girder-type bridges.

 

BRIDGES STRUCTURES

There are two types of bridges structure, they are as follows

• Superstructure
• Substructure

Superstructures

It comprises of all the components of bridges above the support.

Substructures

The substructure consists of all elements required to support superstructure and overpass and road way.

 

 

About the author

Sunny Raza is a student of Third year, Urban Engineering at NED University. He did his Second year internship at the National Highway Authority.