Composite means that the steel structure of a bridge is fixed to the concrete structure of the deck so that the steel and concrete act together, so reducing deflections and increasing strength. This is done using shear connectors fixed to the steel beams and then embedded in the concrete. 

4.  Composite means that the steel structure of a bridge is
fixed to the concrete structure of the deck so that the
steel and concrete act together, so reducing deflections
and increasing strength.
This is done using
shear connectors
fixed to the steel
beams and then
embedded in the
concrete.

5. For generating the composite action of concrete and steel
shear connector are used.
Shear connectors, correctly spaced to resist the loads make
the concrete work compositely with the steel.

6.  Spans of the simple beam bridge varies from 8m to 24m

7.  Used for the longer span from 18m to 100m

8.  High efficiency
 Light weight and Rapid Installation
 Low maintenance
 Highly resistant to earthquakes
 As deck slab are not thick and thus easy to demolish
and remove

9. • Damaged or faded materials must be replaced.
• It is temperature sensitive and expand and contract with
temperature variation.
• High initial cost.
• With respective to concrete girder the steel girder is more
costly.
• Handling during fabrication is difficult.