πTYPES OF BRIDGES β COMMON BRIDGE TYPES, KEY FEATURES & APPLICATIONS
π₯Bridges are essential civil engineering structures designed to provide safe passage over rivers, valleys, roads, railways, and other obstacles.
βΊDifferent types of bridges are selected based on span length, loading conditions, site requirements, structural behaviour, and construction cost.
π1. Beam Bridge
- One of the simplest and most common bridge types.
- Consists of a horizontal beam supported by piers or abutments.
- Loads are transferred mainly through bending and shear.
βΊApplications: Small rivers, roads, culverts, and short-span crossings.
π2. Truss Bridge
- Uses interconnected triangular structural members.
- Provides high strength with efficient material usage.
- Suitable for medium and long spans.
βΊApplications: Railway bridges, highways, and heavy-load crossings.
π3. Arch Bridge
- Uses a curved arch to transfer loads mainly through compression.
- Strong, durable, and aesthetically attractive.
- Requires suitable foundations to resist horizontal thrust.
βΊApplications: River crossings, valleys, and landmark bridges.
π4. Cable-Stayed Bridge
- The bridge deck is supported by inclined cables connected directly to pylons.
- Offers high stiffness and structural efficiency.
βΊApplications: Major river crossings and long-span highways.
π5. Suspension Bridge
- The deck is suspended from vertical hangers connected to main cables.
- Suitable for very long spans.
βΊApplications: Wide rivers, sea crossings, and deep valleys.
π6. Cantilever Bridge
- Constructed using projecting structural arms extending from supporting piers.
- Can be constructed without temporary supports across the entire span.
βΊApplications: Deep valleys, wide waterways, and major transportation routes.
π7. Viaduct Bridge
- A long bridge consisting of multiple spans, often supported by arches or piers.
- Used to cross valleys, roads, and low-lying areas.
βΊApplications: Railways, highways, and urban transportation.
π8. Bascule Bridge (Drawbridge)
- A movable bridge with one or two lifting leaves.
- Uses counterweights and mechanical systems.
- Allows ships and boats to pass underneath.
βΊApplications: Ports, canals, and navigable rivers.
π9. Vertical-Lift Bridge
- The bridge deck moves vertically between two towers.
- Counterweights help balance the movable span.
- **Applications: Ports, ship channels, and industrial waterways.
π10. Pontoon Bridge (Floating Bridge)
- Supported by floating structures called pontoons.
- Can be temporary or semi-permanent.
βΊApplications: Military operations, emergency crossings, and temporary access.
π11. Tied-Arch Bridge (Bowstring Bridge)
- Combines an arch rib with a horizontal tie member.
- The tie resists horizontal thrust from the arch.
βΊApplications: Urban roads, rivers, and medium-span crossings.
π12. Box-Girder Bridge
- Uses hollow box-shaped structural girders.
- Provides excellent torsional resistance and structural stiffness.
- Commonly constructed using reinforced or prestressed concrete or steel.
βΊApplications: Expressways, metro systems, and long continuous bridges.
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