Wabash Pedestrian Bridge Design - PowerPoint PPT Presentation

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Wabash Pedestrian Bridge Design

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  1. Wabash PedestrianBridge Design For Riverfront Development Committee INC. and The City of Terre Haute

  2. Overview • Project Description • Design Requirements • Project Approach • Summary / Conclusions

  3. Project Description • Help jump start the “take back the river” initiative • Trail & wetlands past projects • The big picturefor Terre Haute

  4. Project Description • Extend the National Road Heritage Trail • Host of the Division I National Cross-Country Finals • Become the “running capital” of America

  5. Design Requirements • Distinguish Indiana’s statewide trail system • Four bridge design options • Accommodate simultaneous pedestrian and bicycle use • Wastewater collection line

  6. St. Mary of the Woods College US HWY 40 Dresser Community Fairbanks Park Bridge Site Crossing Hulman Street I-70

  7. Site Location Fairbanks Park Site • Best of 4 total locations • Total bridge length ~890 feet • Highly visible • Topography lends itself well • Does not interfere with Dresser community

  8. Bridge Design Options • Historic Bridge Relocation – INDOT • Prefabricated Bridge • US 40 Replica Bridge • Signature Structure

  9. Breakdown of Assessment Construction Cost - Materials, erection, funding Aesthetics - Visibility - Geometry - Transparency

  10. Bridge Design Selection Determined using a decision matrix Aesthetics Construction Average Weighted (60%) Costs (40%) Rating Bridge Option Prefabricated US 40 Replica 2 3 2.4 1 3 1.8 3 2 2.6 Signature Structure

  11. Signature Structure Double Thrust Arch

  12. Arch Design • Height = 130 feet • Length = 630 feet between ends • Width = 20 feet at deck connections • Cables evenly spaced every 15 feet

  13. Arch Design Nine Loading Scenarios 1 Dead Load 2 Pedestrian Load (Uniform and Patch) 2 Ambulance Load (Mid-span and Abutment) 1 Wastewater Collection System 3 Wind (Longitudinal, Transverse, Uplift)

  14. Arch Design 3 Separate members designed utilizing: MASTAN2 Structural Analysis Software AASHTO Guide Specifications for Design of Pedestrian Bridges AASHTO Standard Specifications for Design of Highway Bridges AISC Steel Construction Manual

  15. Superstructure Design Steel Girder

  16. Superstructure Design • Steel girder design for approach and center spans • Concrete slab design • AISC Steel Construction Manual, ACI Code, AASHTO Standard Specifications for Highway Bridges, AASHTO Guide Specifications for Design of Pedestrian Bridges

  17. Superstructure Design Element Member Dimensions Other Characteristics Approach Girder Width Top Flange = 17 ft Built up section using A36 steel plates Width Bottom Flange = 15 in Depth = 3 ft Transverse Stiffeners @ 4 ft Thickness Top Flange = 0.75 in Thickness Bottom Flange 0.5 in Longitudinal Stiffeners @ 4 ft from centerline. Thickness Web = 1 in Center Span Girder Width Top Flange = 17 ft Built up section using A36 steel plates Width Bottom Flange = 15 ft Depth = 3 ft Transverse stiffeners @ 3 ft Thickness Top Flange = 0.75 in Longitudinal stiffeners @ 4 ft from centerline and @ 1 ft. from centerline. Thickness Bottom Flange = 0.25 in Thickness Web = 0.3 in

  18. Superstructure Design SlabCross- Section Reinforced Concrete Slab Element Element Characteristic Concrete Thickness = 8 in. Flexural Reinforcement No. 5 bars @ 9 in. on center in both Positive and negative regions running transversely Temperature and Shrinkage No. 4 bars @ 12 in. on center spacing running longitudinally Clear Cover 2.5 in. clear cover

  19. Subsurface Investigation Soils: • East Bank = Sandy Glacial Outwash • West Bank = Loamy Alluvium Bedrock: • Carbondale Group • ~110 feet below ground surface

  20. Foundation Design Challenges: • Uncertain Soil Properties • Both Lateral and Vertical Loading • Broms Method (Lateral) • Tip & Side Friction Methods (Axial) • Five Separate Designs • East & West Abutments • East & West Arch Foundations • West Pier

  21. West Bank

  22. East Bank

  23. Arch Foundation Design 228 k 263 k 160 k Plan View Side Elevation

  24. Pier Design 25.0 k/ft Side Elevation Plan View

  25. Abutment Design • West Bank: ω= 17.1 k/ft • East Bank: ω = 16.3 k/ft ω Plan View Side Elevation

  26. Foundation Summary

  27. Cross Section #8 Cross Section #7 Cross Section #6 Cross Section #5 Cross Section #4 Hydraulic Study Cross Section #3 Proposed Bridge Modeled using HEC-RAS Modeled with and without the proposed bridge Used 2 downstream cross sections and 7 upstream cross sections Cross Section #2 Cross Section #1

  28. Hydraulic Study • Modeled with bridge deck above floodplain • Arch piers modeled as vertical piers for simplicity Cross Section #2

  29. Hydraulic Study • W.S. elevation change less than 0.14 ft required by IDNR • Greatest change in elevation is 0.06 ft 0.06

  30. Cost Estimate Subtotal = $1,835,000 Prices for steel plates from: Discount Steel, Inc Prices for steel cable from: Southwest Wire Rope

  31. Cost Estimate Subtotal = $1,912,000 Prices for steel plates from: Discount Steel, Inc. Prices for concrete and rebar from: RS Means, Building Construction Cost Data

  32. Cost Estimate Subtotal = $175,000 All prices taken from: RS Means, Building Construction Cost Data

  33. Cost Estimate • Includes • Material cost • Labor cost • Equipment costs • Overhead & Profit Total Cost + Design Fees = $4,511,000

  34. Conclusions • Project Background • Site Location • Design Options and Assessment • Subsurface Investigation • Foundation Design • Bridge Deck Design • Bridge Arch Design • Hydraulic Study • Cost Estimate

  35. Questions?