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.
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Composite bridge
1.
2.
3.
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
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.
Editor's Notes
Three main economic advantages of composite construction are :
For a given span and loading system a smaller depth of beam can be used than for a concrete beam solution, which leads to economies
in the approach embankments.
The cross-sectional area of the steel top flange can be reduced because the concrete can be considered as part of it.
Transverse stiffening for the top compression flange of the steel beam can be reduced because the restraint against buckling is provided by the concrete deck.
On short spans 8m, 10m, 15m and then more expensively up to 24m, bridges can be made from a number of beams under the roadway straight across the gap.