The Reinforced Chord Is An “Enhancement Component” Of The Bailey Bridge

The presence of the reinforced chord enables the Bailey bridge, using the most economical standardized components, to be assembled into a bridge structure capable of accommodating ultra-long spans or extremely heavy loads.

Significantly Improving Flexural Capacity
The upper and lower chords of the Bailey bridge truss are the main members that bear bending moments. When the bridge needs to span a relatively long distance or withstand heavy loads (such as tanks or heavy trucks), the strength of a single-single truss configuration is often insufficient.

Principle: The reinforced chord is tightly attached to the chord of the existing truss (typically the upper chord or lower chord) using bolts or pins, effectively increasing the sectional height and thickness of the chord.
Effect: This composite structure greatly enhances the flexural section modulus of the truss. In practical applications, after installing reinforced chords, the allowable bending moment (flexural bearing capacity) of the bridge can generally be increased by approximately double.