copyright © arema 2010 15: 1 of 32 module 15: railway structures
TRANSCRIPT
COPYRIGHT © AREMA 2010 15: 1 of 32Module 15: Railway Structures
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Objectives• Bridge Types
–Substructure–Superstructure
• Loading – E80 vs. HS-20• Special Design Consideration• AREMA MRE• Inspection & Maintenance• Other Structures
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SUBSTRUCTURE
• Timber
• Cast-in-Place Concrete
• Precast Concrete
• Steel
• Stone Masonry
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Timber Substructure
• Limited to shorter spans
• Prone to fire and decay
• Quick and cheap!
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Timber Substructure
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Concrete Substructure (CIP)
• Common material
• Readily available
• Reasonable cost
• Long-term service
• Low-maintenance
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Foundations
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Precast Substructure
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Steel Substructure
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Stone Masonry Substructure
• Constant Maintenance
• Antiquated Method• Variable Materials
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SUPERSTRUCTURE
• Timber
• Steel
• Cast-in-Place Concrete
• Precast Concrete
• Stone Masonry
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Deck Type
Open Deck Ballast Deck
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Deck Type
Open Deck
Ballast Deck
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Timber Superstructure
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Concrete Superstructure
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Steel: Deck-Plate Girder
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Deck-Plate Girder
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Steel: Through-Plate Girder
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Through-Plate Girder
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Steel: Truss Spans
• Longer Spans• Various Types
– Through– Deck– Pony
• Limited Geometry
• Expensive
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Steel: Truss
• Pin-Connected• Rivet vs. Bolt• Tuning• Age & Condition
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Steel: Movable Spans
Swing Span
Lift Span
Bascule Span
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Loading
Cooper E-80 Loading
One E-80 (Locomotive) Axle = Highway Truck (HS-20)!
Alternate Live Load
100
,00
0
100
,00
0
100
,00
0
100
,00
0
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Design Issues
• Fatigue
• Impact
• Fracture Critical Members (FCM)
• Deflections
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Work without Interruptions
• Construction
• Inspection
• Maintenance
• Design Parameters
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FRA Bridge Worker Safety
• SAFETY FIRST!• Recovery Plan &
Equipment• Potential Fines /
Penalties• www.fra.dot.gov
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AREMA MRE Navigation
• Chap. 7 – Timber Structures• Chap. 8 – Concrete Structures• Chap. 15 – Steel Structures• They’re ALL Different!
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Additional Structures
• Culverts• Retaining Walls• Tunnels• Unloading Pits• Buildings / Sheds• Platforms
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Retaining Structures
Drilled Shaft
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Retaining Structures
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Questions?
Authors:
Don McCammon, P.E.HDR Engineering, Inc.
(406) 532-2204
Dallas R. Richards, P.E.Arcadis, Inc. (703) [email protected]