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Composite bridge
The document discusses composite bridge structures where steel beams are integrated with concrete decks using shear connectors, enhancing strength and reducing deflections. These structures are efficient, lightweight, and earthquake-resistant, but have a high initial cost and can be temperature sensitive. Challenges include handling during fabrication and the need for maintenance and material replacement due to damage.
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Composite bridge
- 4. Composite meansthat 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 thecomposite 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 ofthe simple beam bridge varies from 8m to 24m
- 7. Used forthe 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 orfaded 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
- #4 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.
- #7 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.