The steel truss bridge is a structural system between beams and arches. It is a structure in which a bent upper beam structure and a pressure-bearing lower column are integrated together. Due to the rigid connection between the beam and the column, the beam is unloaded due to the flexural rigidity of the column. The entire system is a compression-bending structure as well as a thrust structure.

According to the different position of the bridge floor, it is divided into:

• Upper bearing steel truss bridge (bridge floor located in the upper part of the main truss)
• Lower bearing steel truss bridge (bridge floor located in the lower part of the main truss)

The primary components of a steel truss bridge are the truss members. These members are typically made of steel and are connected together to form triangular shapes.

Beams, also known as chords, are the horizontal members of the truss that span the entire length of the bridge. They provide support for the bridge deck and help distribute the weight of the bridge and its load. Chords are usually located at the top and bottom of the truss.

The main load-bearing structure that bears vertical loads. Composed of:

• Upper chord
• Lower chord
• Belly rod (divided into diagonal bar and vertical bar)

Classification:

• Longitudinal connection
• Horizontal connection

Function: Connect the main truss, making the bridge span structure become a stable space structure that can withstand various lateral loads.

Composition:

• Longitudinal beam
• Beam and the connection between the longitudinal beam

Force transmission: Load → longitudinal beam → beam → main truss.

The part for vehicles and pedestrians to walk on. Similar in form to steel beam bridges and combined beam bridges.

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

Features many bar specifications and large internal force of the vertical rod. All are large nodes.

The shear force of the same node is borne by two diagonal rods, which are small and short in section. Complex structure for small and medium spans, but suitable for large spans.

Same internode shear force is borne by two diagonal rods. Used for large spans with short compression inclined rods favorable for buckling stability.

• Large span capability
• Fast construction speed
• Energy efficient
• Beautiful appearance
• Wide application
• Customizable design

• Railroad Bridges (standard gauge and light rail systems)
• Highway and Road Bridges
• Industrial Bridges (transportation of goods and materials)