The High Stiffness Steel Rigid Frame Bridge is a composite structural beam bridge that combines steel members (such as steel plate beams, steel box beams, and steel truss beams) with reinforced concrete members working together through shear connectors. This innovative design alleviates dead load while maintaining structural integrity.

• Easy slope and superelevation adjustment
• Increased section stiffness reduces steel quantity
• Lower noise under live load compared to all-steel bridges
• Uses short section steel components (channel steel, angle steel)
• Flexible shear transfer system with diagonal reinforcement options

For medium and small spans, these bridges typically use I-section steel beams (rolled or welded) to reduce production and installation costs. Asymmetric steel beam sections can be used to minimize the upper flange size.

Offering higher torsional rigidity and stability than I-section bridges, this design increases crossing capacity while solving clearance issues. Concrete pouring in negative bending moment zones enhances stability.

Features better permeability and aesthetics using steel trusses combined with concrete bridge panels. Requires more complex joint designs due to increased beam height.

Steel-concrete composite beams consolidated with concrete piers offer large headroom, beautiful shape, and higher seismic performance. Reduces steel usage and noise pollution while increasing structural stiffness.

The design considers two stages: steel beams bear initial dead loads, while the composite section bears subsequent loads. Specific calculations vary based on structural configuration and applicable design codes.

Critical for joint operation between steel beams and concrete panels, shear keys withstand longitudinal shear forces. Common types include welded nail, channel steel, and perforated plate connectors.

• Convenient construction with lightweight steel components
• Reduced dead load compared to concrete bridges
• Optimized material performance (steel in tension, concrete in compression)
• Cost-effective solution, especially for long spans

• Highway and railway bridges
• Industrial and commercial developments (ports, complexes)
• Rehabilitation and replacement of aging bridges