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Trout Run Trail Bridge - Design

ASCE Structural Engineering Conference Presentation

November 4, 2013

Presentation Topics

• Project Background• Design• Aesthetics

Trout Run Trail Bridge 

PROJECT BACKROUND

Location

• NE Iowa• Winneshiek County• City of Decorah• Trout Run Trail over

State Highway 9Ames

Decorah

Design Partners

• Owner– City of Decorah

• Design Engineers– Erdman Engineering– WHKS & Co.

• Engineering Support– Braun Intertec– Iowa Department of Transportation

Construction Partners

• Prime Contractor– Cramer and Associates

• Post Tensioning Contractor– Freysinnet, Inc.

Project History

• 2001 “Trails of Winneshiek” formed– Planned to connect local destinations– Developed an 11 mile long “looped” trail

• 2003 Preliminary Engineering– Landowner Agreements– Budget Estimates– Grant writing

Project History

• 2006 Trail Design Begins– 12 segments, 4 spurs

• IA 9 Bridge Design Begins – February 2011

• Letting Date - October 18, 2011– Construction Began in Nov. 2011

• 2012 Final Segment Completed– Bridge opened in September 2012

IA 9 Bridge

Trout Run Trail Bridge 

DESIGN

Trout Run Trail Bridge 

DESIGN

Codes and References

• AASHTO LRFD 4th Edition, 2007• AASHTO LRFD Guide Specifications for the

Design of Pedestrian Bridges, 2009• Florida DOT - Specifications and Design Manual• “Structural Modeling of Posttensioned Members”

Journal of Structural Engineering – February 2000

• Post Tensioning Design Manual

Designed Elements

• Post-Tensioned Slab• Arches• Piers• Abutments• Railing

Design Programs

• “STAAD.Pro V8i” by Bentley

• “Biaxial Column v3.0” by FDOT (Florida DOT)

• “DFSAP” by WSDOT (Washington State DOT)

• “FB-Pier” by BSI (Bridge Software Institute)

• “Excel” by Microsoft

• “MathCad” by PTC

Superstructure Design

Superstructure Design

Superstructure Design

Substructure Design

Railing Design

Decorah – Trout Run Trail London – Milleneum Bridge

Trout Run Trail Bridge

AESTHETICS

Aesthetics

• Bridge Form• Railing• Concrete Form Liner• Colored Concrete Sealer• Lighting

Bridge Form

Railing

Form Liner and Colored Sealer

Lighting

Lighting

Lighting

Lighting

Trout Run Trail Bridge

QUESTION & ANSWER PERIOD

Trout Run Trail Bridge 

DESIGNTrout Run Trail Bridge

ASCE Structural Engineering Conference Presentation

November 4, 2013