Transcription of Chapter 38 Railroad Structures
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Chapter 38 Railroad Structures
WisDOT Bridge Manual Chapter 38 Railroad Structures January 2017 38-1 Table of Contents Introduction .. 3 Design Specifications and Design Aids .. 4 Specifications .. 4 Design Aids .. 4 Horizontally Curved Structures .. 4 Railroad Approval of Plans .. 5 Design Considerations .. 6 Superstructure .. 6 Methods of Design, Selection Type and Superstructure General .. 6 Ballast Floor .. 9 Dead Load .. 9 Live Load .. 10 Live Load Distribution .. 10 Stability .. 12 Live Load Impact .. 12 Centrifugal Forces on Railroad Structures .. 14 Lateral Forces From Equipment .. 14 Longitudinal Forces on Railroad Structures .. 15 Wind Loading on Railroad Structures .. 15 Loads from Continuous Welded Rails .. 16 Fatigue Stresses on Structures .. 16 Live Load Deflection .. 17 Loading Combinations on Railroad Structures .. 17 Basic Allowable Stresses for Structures .. 17 Length of Cover Plates and Moment Diagram .. 18 Charpy V-Notch Impact Requirements.
The principles of designing railroad structures are similar to those for structures carrying highways. However, structures carrying railways have much heavier loadings than those subject to highway loadings due to increased dead load, live load and impact required for railways.
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