A steel plate girder bridge is composed of steel plates welded, bolted or riveted to form a solid belly steel beam as the main bearing structure, with a cross section that is mostly I-shaped.

By driving mode: Upper bearing plate beam and bottom bearing plate beam.

By connection type: Riveted plate beam, fully welded plate beam and bolted welded plate beam.

The economic span of simply supported steel plate girder bridge is generally below 40m, while continuous steel plate girder bridge can reach up to 60m.

Composition:

• Load-bearing structure (main beam)
• Bridge floor
• Connecting system
• Support

The bridge deck is located on the upper flange of the main beam. The main load-bearing structure consists of two steel plate beams that primarily bear vertical loads.

Key Characteristics:

• Lower building height (from rail bottom to beam bottom)
• Requires more materials and manufacturing labor
• Cannot be transported as whole units, increasing installation workload

• Components are ideal for industrial manufacturing methods
• Easy to transport with fast on-site installation
• Simple to repair and replace after damage
• Requires regular maintenance due to weather exposure

Highway and roadway bridges: Accommodate heavy traffic loads and span long distances for major transportation corridors.

Railway bridges: Support heavy train loads while providing necessary clearance for rail traffic in both mainline railways and light rail systems.

• High strength-to-weight ratio
• Exceptional durability
• Streamlined construction process
• Off-site fabrication reduces construction time and traffic disruption