Load Paths in Historic Truss Bridges
Acknowledgements
Abstract
1.1 Introduction
1.2 Goals
1.3 Rehabilitation for Preservation
1.4 Traditional vs. Modern Analysis
1.5 Summary of Bridges Studied (4-7)
1.5 Summary of Bridges Studied (8-11)
1.6 Loads
1.7 Materials
1.8 Customary Analysis
2.1 Modeling Considerations
2.2 Fruita Bridge

1.5 Summary of Bridges Studied (4-7)

It was believed that to be of the greatest practical value in aiding preservation efforts that real bridges be examined. The study focused on five real – not “textbook” – structures located throughout Colorado as shown in Figures 1.1 through 1.13. All of the bridges are through-trusses, all are former highway bridges, all are pin-connected with moment-resisting portal frames at the ends, all are metal – either wrought iron or steel, and all have horizontal trusses consisting of rod X-bracing intended to resist lateral loads.

Figure 1.1. Fruita Bridge over the Colorado River, near Fruita Colorado.

Figure 1.3. Photo of Fruita Bridge believed to be from spring of 1907,
when the bridge was under construction.

Figure 1.4. Undated photograph of completed bridge.

Figure 1.5. Prowers Bridge over the Arkansas River, near Lamar,
Colorado.

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