Pratt Truss Prefabricated Steel Bridges


The most common truss style is the Pratt Truss.  This is a parallel chord truss with diagonal members slanting toward the center of the span and separated by verticals.  Double diagonals can be added at additional expense.

The Pratt Truss can be built with underhung floor beams, as an H-section (floor beams connected to the verticals) or with overhead bracing.  In general the H-section is the most efficient design.  For short and medium spans, underhung floor beams provide greater clearance under the bridge.  Overhead bracing may be preferred for longer spans.           View Examples

 Click and drag image to rotate bridge.
Click Here to Zoom

Pratt Truss

Pratt Truss

Top of Page