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

• Section form of main arch ring: steel box arch, steel pipe arch, steel truss arch
• Space posture of two arch ribs: parallel arch ribs, basket arch ribs, butterfly arch ribs
• Position of carriageway system: upper bearing type, middle bearing type and lower bearing type arch bridge
• Layout of boom: parallel vertical boom, inclined boom, mesh boom

Steel arch bridges have both composite system arch bridges and simple system arch bridges:

• Simple system arch bridge: Only the arch ring is the main force component, with thrust directly borne by the pier or foundation
• Combined system arch bridge: Carriageway beam and arch combination, common force including tie arch, loser arch, lange arch systems

Steel arch can be designed into truss arch, box arch, or plate arch. Truss arch bridges are particularly important for large spans.

• Layout of arch rib truss
• Arch axis configuration
• Vector span ratio (typically 1/4~1/5)
• Height selection of vault and arch foot
• Boundary conditions
• Bar section form and area

The main load-bearing members that primarily bear axial pressure but also some bending moment. Available in box, pipe, or truss type sections.

Force transfer components that transmit deck loads to arch ribs. Available as rigid (steel pipe/section) or flexible (high-strength wire) configurations.

Bears the thrust of non-thrust arches through axial tension. Available in rigid or flexible forms.

Ensures transverse stiffness and stability, with common forms including one-word, K-shaped, X-shaped, and meter-shaped configurations.

• Magnificent appearance with large span capacity (up to 552m built)
• High carrying capacity with efficient load transfer through arch design
• Requires abutments and piers for support and stability
• Versatile applications from highway overpasses to iconic landmarks