The primary load-bearing structure composed of upper chord, lower chord and belly rod (diagonal and vertical bars). Nodes are categorized as large or small with pitch referring to the distance between nodes.

• Classification: Longitudinal connection and horizontal connection
• Function: Connects main trusses to form stable space structure capable of withstanding lateral loads
• Longitudinal system handles transverse horizontal loads including wind and centrifugal forces
• Transverse connection increases torsional stiffness and adjusts force distribution

Composed of longitudinal beams and cross beams with load transfer path: deck → longitudinal beams → cross beams → main truss.

Triangular Truss

Simple structure with fixed design, easy to install and manufacture.

Diagonal Bar Truss

Features multiple bar specifications with large internal forces in vertical rods and all large nodes.

K-Shaped Truss

Shear force distributed to two diagonal rods with short sections. Complex structure suitable for mounting/dismounting bridges.

Double-Vented Bar Truss

Features two diagonal rods per node with small sections, ideal for large spans with favorable buckling stability.

Steel truss bridges are widely used for highway, railway, and pedestrian crossings over rivers, valleys, and urban areas. Their modular nature allows customization for various site requirements and traffic volumes.

Regular inspections for corrosion, fatigue, or damage are essential. Corrosion prevention through painting, galvanization, or cathodic protection ensures longevity. Damaged members must be repaired promptly.

• High Strength: Efficient load distribution through truss structure
• Durability: Withstands environmental conditions with proper maintenance
• Design Flexibility: Multiple configurations (Pratt, Warren, K-truss) for various requirements
• Long Service Life: Properly maintained bridges last decades