The composite beam bridge combines steel members (such as steel plate beams, steel box beams, or steel truss beams) with reinforced concrete members through shear connectors to create a unified structural system. The steel section provides primary strength and stiffness, while the concrete slab acts as a compression member and protects the steel from fire and corrosion.

• Durable and low maintenance: Concrete protection reduces steel corrosion risk
• Flexible shear transfer through welded connectors
• Reduced noise compared to all-steel bridges
• Easy adjustment of slope and superelevation
• Combined section efficiency maximizes material performance

I-section steel beams for medium and small spans, offering cost-effective production and installation. Can utilize rolled or welded steel beams with asymmetric sections to optimize flange dimensions.

Superior torsional rigidity and stability compared to I-section bridges. Enables increased crossing capacity and solves clearance issues. Negative bending moment zones can be reinforced with additional concrete.

Steel truss combined with concrete deck provides excellent permeability and aesthetics. Offers construction flexibility with prefabricated trusses and multiple deck casting options.

Integrated with concrete piers for reduced bridge floor load and improved seismic performance. Features large headroom and excellent bridge floor smoothness.

• Steel beams primarily handle tension forces
• I-shaped steel beams for small/medium spans (often asymmetric)
• Box girders for large spans (especially curved bridges)
• Multiple bridge deck options (cast-in-place or precast)
• Various shear connector types (welded nails, channel steel, perforated plates)

• Construction convenience with lightweight steel components
• Reduced dead load compared to concrete bridges
• Optimized material performance (steel in tension, concrete in compression)
• Cost efficiency, especially for long spans
• Long service life with minimal maintenance

• Highway bridges
• Railway bridges
• Pedestrian bridges
• Urban overpasses