Table of Contents

• Introduction
  • In Situ Timber Railway Bridges
  • Goal and Objectives
  • Test Program Description
  • Project Background
• Description of Test Bridges
  • General Description of Open Deck Timber Trestle Bridges
  • Bridge No. 32.35 (Fort Collins)
  • Bridge No. 32.56 (Fort Collins)
  • Bridge No. 101 (Pueblo)
• Assessment of Material Properties
  • Objective and Background
  • Selection and Testing of Timbers
  • Stiffness Evaluation Results
  • Analytical Modeling Approach
  • Pinned Single Span Beam Model
  • Continuous Beam Model
  • Semi-Continuous Beam Model
  • Extended Semi-Continuous Chord Model
  • Fixed End Beam Model
  • Load Application
• Field Load Testing
  • Bridge Loading Equipment
  • Load Test Methodology
  • Loadings Used
  • Instrumentation
• Results of Static Load Tests
  • Static Load Test Results - Bridge 32.35
  • Displacements Relative to the Displaced Chord
  • Measured Results
  • Comparison of Analytical and Measured Results
  • Deflections Relative to the Ground
  • Measured Results
  • Observations from the Static Load Testing
• Ramp Loading Test Results
  • Ramp Loading Tests
  • Bridge 101 Results
  • Linear Behavior of Transducer and Extensometer Measurements
  • Deflections Relative to the Displaced Chord
  • Displacements Relative to the Ground
  • Investigation of Support Motion and Gap Closing
• Load Distribution Between Piles
  • Empirical Formulation
• Rolling Load Tests - Bridge 101
  • Conduct of the Tests
  • Test Results
• Conclusions and Recommendations
• References

Field Load Tests of Open Deck Timber Trestle Railroad Bridges

Richard M. Gutkowski, Professor

Research Assistants:

Geoffrey Robinson
Abdalla Shigidi

Colorado State University

August 2001

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