The document discusses the advantages of using pre-fabricated truss bridges for two bridge replacement projects in South Carolina. It notes that pre-fabricated truss bridges have a shallower structure depth, require less construction activity within railroad rights-of-way, and provide significant cost savings compared to traditional bridge options. The document provides details on the design, fabrication, and construction process for the pre-fabricated truss bridges.
13. Reduced Construction Activity
Within Railroad Right of Way
• Accelerate construction schedule
• Smaller footprint for staging area
• Increase Safety
• Reduce road closure duration
14. Significant Cost Savings
$1,690,000 Total Cost of Plate Girder Option
- $400,000 Savings for Superstructure
- $110,000 Savings for Roadway Items
- $40,000 Savings for Railroad Flagman
$1,140,000 Total Cost of US Bridge Option
TOTAL COST SAVINGS = $550,000
OVER 30% COST REDUCTION
Cost basis - bid unit cost from actual construction
15. Advantages of
Pre-fabricated Bridge
• Shallowest structure depth
• Less fill for approaches
• Smaller footprint
• Same loading capacity
• Reduced construction activity within
railroad right-of-way
• Accelerate construction schedule
• Smaller footprint for staging area
• Increase safety
• Reduce delay
16. Advantages of
Pre-fabricated Bridge
Significant cost savings
• Savings of $550,000 for both projects
• 30% cost reduction
17. “... the bridges are great. They provided an economical and
aesthetically pleasing solution to obtaining adequate clearance
over CSXT.”
Todd Carroll, CTC Engineering Supervisor
Spartanburg County Public Works
18. U.S. Bridge
• Founded as American
Culvert in 1936 by
brothers Herman &
Ted Rogovin
20. Location
• Cambridge, Ohio
• Juncture of I-70 & I-77
• 21 shops covering 250,000
sq ft. in 11 buildings
21. How We Work With You
• Feasibility Assessments
• Programming Costs
• Specifications
• Schematic Details
• Preliminary Engineering
• Supplemental Contract
Documents
• Modeling & Rendering
• Hard Bid Quotes & Information
• Engineering Design & Plan
Submittals
22. How We Work With You …
• Construction Submittals
• Installation Assistance
• Engineering Department
• 4 Professional Engineers
• 2 EIT’s
• 4 Detailers
23. Coordination
• Preliminary Engineering
• Loads & Substructure Reactions
• Structure Depths & Low Steel Clearance
• Final Engineering
• Abutment Seat Elevations
• Plan Submittals & Reviews
Adam Stout, EIT
Estimating Engineer
24. Bridge Truss Design
• Final Design
• Stringer Beams & Connections
• Floor Beams & Connections
• Truss Members & Connections
• Truss Stability
• Gusset Plates
• Bearings
• Deck Slab & SIP Forms
• Misc.
Scott Flaten, PE
Project Engineer
26. Member Calculations
• Non-Composite Stringers sized for • Connections are sized for
Strength I Flexure Strength I and Service Load II
Shear (Slip Critical) and
• Composite Floor Beams sized by checked against block shear
Strength I Flexure
• Floor beam-to-truss connection
• Top Chords sized using truss is also checked against Service
analysis and checked U-Frame Load III (Wind on structure)
Stability to confirm axial capacity
can be developed • Gusset Plates are designed in
accordance with FHWA
• Bottom Chords sized using truss Publication FHWA-IF-09-014
analysis and checked against
fatigue allowable stress
• Truss tension members checked for
gross section yielding and net
section fracture (shear lag and block
shear) and bolt shear
35. Construction
• Overhead Bridge Road Bridge
• Constructed by Taylor & Murphy Construction
Company
• Ezell Road Bridge
• Constructed by Saddlebrook Construction Inc.
36. Overhead Bridge Road
Construction
Stepped Truss & Stringer Abutment Seat with Integral Abutments
