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Superstructure Project Case Study

Superstructure Project Case Study. Steel vs. Concrete. Short Span Steel Bridges Compete and Win. Case Study Bridges: Side-by-Side Comparison. Audrain County, MO Bridge 411 Built 2012 Steel 4 Girders 47.5 ft Span, 24 ft Roadway Width 2 ft Structural Depth No Skew.

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Superstructure Project Case Study

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  1. Superstructure Project Case Study Steel vs. Concrete

  2. Short Span Steel Bridges Compete and Win

  3. Case Study Bridges: Side-by-Side Comparison Audrain County, MO Bridge 411 Built 2012 Steel 4 Girders 47.5 ft Span, 24 ft Roadway Width 2 ft Structural Depth No Skew Steel Concrete Audrain County, MO Bridge 336 Built 2012 Precast 6 Hollowcore Slab Girders 50.5 ft Span, 24 ft Roadway Width 2 ft Structural Depth 20o Skew

  4. Total Bridge Costs Material = $41,764 Labor = $24,125 Equipment = $21,521 GuardRail = $ 7,895 Rock = $ 8,302 Engineering = $ 8,246 TOTAL = $111,853 Case Study Bridges: Side-by-Side Comparison Steel Concrete Total Bridge Costs Material = $67,450 Labor = $26,110 Equipment = $24,966 GuardRail = $ 6,603 Rock = $ 7,571 Engineering = $21,335 TOTAL = $154,035

  5. Total Bridge Costs per ft2 Total Cost = $ 97.48 / ft2 Total Construction Cost = $ 90.29 / ft2 (no Engineering) Adjusted Construction Cost = $ 83.05 / ft2 (no Engineering or Rock) Case Study Bridges: Side-by-Side Comparison Steel Concrete Total Bridge Costs per ft2 Total Cost = $ 120.82 / ft2 Total Construction Cost = $ 104.08 / ft2 (no Engineering) Adjusted Construction Cost = $ 98.14 / ft2 (no Engineering or Rock)

  6. Superstucture Costs Material Girders = $21,463 Deck Panels = $ 7999 Reinf Steel = $ 3135 Concrete = $ 4180 Labor = $ 5522 Equipment* = $ 500 SUPER TOTAL = $42,799 SUPER TOTAL = $37.54 / ft2 Case Study Bridges: Superstructure Only Comparison (Remove Site Prep, Abutment, Grading & Finishing, Guardrail, Engineering, Rock, Etc) Steel Concrete Superstructure Costs Material Slab Girders = $50,765 Deck Panels = $ 0 ReinfSteel = $ 724 Concrete = $ 965 Labor = $ 4884 Equipment* = $ 4000 SUPER TOTAL = $61,338 SUPER TOTAL = $50.61 / ft2 *County Crane (30 Ton) used for Steel, Larger Rented Crane (100 Ton) Required for Concrete (Equivalent County Crane Cost is $1520, would result in Steel Cost of $38.88 / ft2)

  7. Case Study Bridges: Audrain County, MO • Same bridge conditions: • Structural Depth = 2 ft (No Difference in Approaches) • Roadway Width = 24 ft • Same Abutments for Both Can be Used (Steel Could Use Lighter) • Same Guard Rail System • Same Work Crew Cost increase of 35% Steel: Superstructure $37.54 per ft2 Concrete: Superstructure Cost $50.61 per ft2

  8. Lighter Cranes Required (Owner Cranes Can Save Costs) Steel Bridge - Advantages

  9. Lighter Abutments Possible for Steel Bridges Steel Bridge - Advantages

  10. Cast-in-Place Deck on Prestressed Concrete Deck Panels Steel Bridge - Economy

  11. Simple and Practical Details Steel Bridge - Economy

  12. Elastomeric Bearings & Integral Abutments Steel Bridge - Economy

  13. Weathering Steel Steel Bridge - Economy

  14. Other Bridges in Missouri – Total Constructed Costs Steel Concrete

  15. Other Bridges in Missouri – Average Total Constructed Costs Steel Concrete

  16. Bottom Line: Short Span Steel Bridges Compete and Win Questions or Comments?

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