The upper structure of steel arch bridge is primarily composed of arch ring, suspension rod (or arch column), tie rod, bridge beam and other components.

• Arch-Beam Combination: Composed of arch rib, longitudinal beam, boom, beam and bridge panel where the horizontal thrust is borne by the longitudinal beam.
• Arch-Tie Rod Combination: Composed of arch rib, tie rod, suspension rod, beam and bridge panel where the horizontal thrust is borne by the tie rod.

• Main Arch Ring Section: Steel box arch, steel pipe arch, steel truss arch
• Arch Ribs Spatial Position: Parallel arch ribs, basket arch ribs, butterfly arch ribs
• Carriageway System Position: Upper bearing type, middle bearing type, lower bearing type
• Boom Layout: Parallel vertical boom, inclined boom, mesh boom

• Simple System Arch Bridge: Only the arch ring bears the main force with thrust directly borne by pier or foundation
• Combined System Arch Bridge: Carriageway beam and arch combination with common force distribution

Steel arch can be designed as truss arch, box arch, or plate arch. Truss arch bridges are particularly important for large span applications.

• Truss Forms: Pratt truss, Warren truss, K truss, sub-truss
• K-type Truss: Best mechanical properties
• W-type Truss: Most economical steel usage
• P-type Truss: Best for construction and aesthetics

The main load-bearing member that primarily bears axial pressure with some bending moment. Available in box, pipe, or truss type sections.

Force transfer component that transmits deck load to arch ribs. Available as rigid (steel pipe/section) or flexible (steel wire/strand) configurations.

Bears the thrust of non-thrust arches through axial tension. Available as rigid or flexible tie rods.

Ensures transverse stiffness and stability while withstanding horizontal forces. Common types include one-word, K-shaped, X-shaped, and meter-shaped braces.

• Rise Span Ratio: Typically 1/4~1/7 (1/4~1/5 for steel truss arches)
• Arch Axis: Arc line, quadratic parabola, or catenary
• Arch Height: Equal height or variable height configurations

• Tie arch suitable for long span rigid arch bridges
• Roser arch ideal for heavy-duty railway bridges
• Rangel arch perfect for double-deck road/railway arrangements

• Adaptable span lengths from short to long distances
• Versatile deck configurations for various traffic needs
• High strength-to-weight ratio of steel construction
• Efficient load distribution and structural performance