The Warren truss is a structural framework composed of longitudinal members interconnected exclusively by angled cross-braces, creating a series of alternating equilateral triangles along its span. This configuration produces a true truss system where each member experiences only axial forces - pure tension or compression - eliminating bending moments and torsional stresses.

In this design, diagonal members alternate between compressive and tensile forces, particularly near the midspan. The absence of vertical web members means central elements must resist both tension and compression under dynamic loading. This efficient force distribution, combined with optimal material usage, results in a remarkably lightweight structure. The uniform length of primary members facilitates prefabrication, making Warren trusses particularly suitable for modular bridge construction.

Common applications include long-span structures (20-100m) such as industrial buildings and the support frameworks for gantry and crane systems, where their strength-to-weight ratio proves especially advantageous.