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Short Span Steel Bridge Alliance

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  1. Short Span Steel Bridge Alliance North Central States Bridge Consortium, Sioux Falls, SD David Stoddard Applications Engineer, SSAB Americas Contact Information

  2. Objectives • Objective of owners & bridge engineers: • More efficient & economical short span bridges • Identify design solutions quickly • Objective of presentations today: • Provide bridge engineers & owners with resources to consider short span steel bridge solutions in design comparisons • Demonstrate steel can be competitive

  3. Outline of Today’s Presentation • Why steel for bridges? • Short Span Steel Bridge Alliance (SSSBA) • Interactive Short Span Steel Bridge Website • Short Span Standards • eSPAN140: Overview • Economics Case Study: Steel vs. Concrete • eSPAN140: Bridges Constructed • Innovative Designs • Training & Education

  4. Why steel for bridges? First Cost/Economical 25% less than concrete with cost-efficient design, fabrication, and construction practices Up to 33% less with new innovative designs concepts Modular Light weight, prefabricated options, easy to construct Standardized plans Durable Highly resistant to natural disasters (seismic) Long life cycle (weathering steel & galvanized options) Sustainable 100% recycled Recycled content (steel has over 90% recycled rate)

  5. Short Span Steel Bridge Alliance Program officially started September 2007 Objective – make steel the material of choice for short span steel bridges. Short span steel bridges have spans up to 140ft First North American industry-wide effort to provide education and design support for short span steel bridges.

  6. Providing Economical Steel Solutions to 140 Feet (40 Meters) 18 - 40 meters 40-100 feet 12-30 meters

  7. Fasteners Coaters Producers Service Centers Fabricators Contractors Design Firms Trade Organizations Universities Bridge Owners

  8. Target Audience (Bridge Owners & Designers) • United States • 3,000 USA County Engineers (Local/Regional Officials) • 50+ USA State DOT • Federal Highway Officials • Consultants, Designers, Universities, etc. • Canada • Ministers of Transportation (MTOs) • Mexico / Latin America • Municipalities

  9. What do we do? Education (webinars, workshops, forums, conferences) Technical Resources (standards, guidelines, best practices) Case Studies (economics: steel is cost-effective) Simple Design Tools (eSPAN140) Answer Questions (Bridge Technology Center) Access to Industry Partners (industry contact list) All FREE for bridge owners & designers

  10. Website • eSPAN140 Web-based Design Tool • Bridge Technology Center • Technical Design Resources • Catalog of Short Span Steel Solutions • Project Case Studies • Video &Photo Gallery • News Updates & Social Media (Twitter / LinkedIn / Facebook) • Email Newsletter (sign-up to receive it) • Calendar of Industry Events www.ShortSpanSteelBridges.org

  11. Membership – Join Today! • Free to join for limited time • See www.ShortSpanSteelBridges.org more a list of benefits • Contact Dan Snyder, Director of the SSSBA • dsnyder@steel.org • 301-367-6179

  12. Standard Short Span Steel Bridge Designs Goals & Design Methods

  13. Standards for Short Span Steel Bridge Designs • Goals: • Economically competitive • Expedite & economize the design process • Simple repetitive details & member sizes. • Bridge Design Parameters: • Span lengths: 40 feet to 140 feet (5-foot increments) • 12 meters to 42 meters (1.5-meter increments) • Girder spacing: 6 feet, 7.5 feet, 9 feet and 10.5 feet • 1.829 meters, 2.286 meters, 2.743 meters, 3.200 meters • Homogeneous & Hybrid plate girders with limited plate sizes • Limited Depth & Lightest Weight Rolled Beam Sections • Selective cross-frame placement/design (AASHTO/NSBA)

  14. Weight Comparisons

  15. Free Online Design Tool for Short Span Steel Bridges Developed by the Short Span Steel Bridge Alliance http://www.espan140.com/

  16. eSPAN140 • eSPAN140 is an easy-to-use and free resource for bridge engineers & owners. • In 3 easy steps, multiple steel solutions are recommended!

  17. Start new project:

  18. Range of available solutions:

  19. Step 1: Project Information

  20. Step 2: Project Details (general dimensions)

  21. Step 2: Project Details (pedestrian access option)

  22. Step 2: Project Details (remaining details)

  23. Step 3: Customized Solutions Book is Provided (pdf) • Standard Design and Details of Short Span Steel Bridges Solutions • Rolled Beam Recommendations • Plate Girder Recommendations • Standard Design and Details of Corrugated Steel Pipe and Structural Plate Solutions • Manufacturer’s Steel Solutions (SSSBA Partners) • Customized Solutions from Members of the SSSBA • Durability Solutions (SSSBA Partners) • Galvanized & Paint • Weathering Steel • Additional Contact Information

  24. Design Example • Sample plate girder (homogeneous) elevation:

  25. Design Example • Sample plate girder (homogeneous) data:

  26. Design Example • Sample rolled beam (lightest weight) elevation:

  27. Design Example • Sample rolled beam (lightest weight) data:

  28. Design Example • Typical girder elevation:

  29. Design Example • Typical stiffener details:

  30. Design Example • Typical diaphragm details:

  31. Design Example • Typical section details:

  32. Design Example • Typical bearing details:

  33. CSP & Structural Plate Standards

  34. Manufacturer’s Solutions

  35. Durability Solutions • Weathering, galvanized, and painted steel

  36. Galvanizing Facts (provided by AGA) • Advancements have led to more economical product • Misconception that it is more expensive than paint • Often less expensive than 2- & 3- coat high performance systems • Galvanizing prices held steady over the last 15 years • Galvanizing’s maintenance-free longevity (70 years of more in atmospheric exposure) often means initial cost is final cost

  37. The Bridge Technology Center • Free resource available to bridge owners and designers with questions related to: • Standard design and details of short span bridges (plate & rolled beam) • Standard design and details of corrugated steel pipe and structural plate.

  38. Short Span Steel Bridge Case Study Steel vs. Concrete Audrain County, MO

  39. Short Span Steel Bridges Compete and Win

  40. Case Study Bridges: Side-by-Side Comparison Audrain County, MO Bridge 411 Built 2012 Steel 4 Girders 47.5 ft. Span (14.478 m) 24 ft. Roadway Width (7.315 m) 2 ft. Structural Depth (0.610 m) No Skew Steel Concrete Audrain County, MO Bridge 336 Built 2012 Precast 6 Hollowcore Slab Girders • 50.5 ft. Span (15.392 m) • 24 ft. Roadway Width (7.315 m) 2 ft. Structural Depth (0.610 m) 20o Skew

  41. Case Study Bridges: Side-by-Side Comparison Total Cost of Structure Steel Concrete • 19.3% Total Bridge Cost Savings with Steel Total Bridge Costs Material = $41,764 Labor = $24,125 Equipment = $21,521 Guard Rail = $ 7,895 Rock = $ 8,302 Engineering = $ 8,246 TOTAL = $111,853 ($97.48 / sq. ft.) Total Bridge Costs Material = $67,450 Labor = $26,110 Equipment = $24,966 Guard Rail = $ 6,603 Rock = $ 7,571 Engineering = $21,335 TOTAL = $154,035 ($120.83 / sq. ft.)

  42. Total Bridge Costs per ft2 Total Cost = $97.48 / sq. ft. Total Construction Cost = $90.29 / sq. ft. (no Engineering) Adjusted Construction Cost = $83.05 / sq. ft. (no Engineering or Rock) Case Study Bridges: Side-by-Side Comparison Steel Concrete Total Bridge Costs per ft2 Total Cost = $120.83 / sq. ft. Total Construction Cost = $104.08 / sq. ft. (no Engineering) Adjusted Construction Cost = $98.14 / sq. ft. (no Engineering or Rock)

  43. Superstucture Costs Material Girders = $21,463 Deck Panels = $ 7,999 Reinf Steel = $ 3,135 Concrete = $ 4,180 Labor = $ 5,522 Equipment* = $ 500 SUPER TOTAL = $42,799 SUPER TOTAL = $37.54 / sq. ft. 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 Reinf Steel = $ 724 Concrete = $ 965 Labor = $ 4,884 Equipment* = $ 4,000 SUPER TOTAL = $61,338 SUPER TOTAL = $50.61 / sq. ft. • *Added cost to use galvanized steel = $5,453.80 or $0.22 / lb. (includes est. 10% fabrication fee) • ** Cost to use weathering steel is approximately $0.04 / lb. (already included in cost in example) *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 / sq. ft. )

  44. Case Study Bridges: Audrain County, MO • 25.8% superstructure cost savings • 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 Steel: Superstructure $37.54 per sq. ft. Concrete: Superstructure Cost $50.61 per sq. ft.

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

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

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

  48. Simple and Practical Details Steel Bridge - Economy

  49. Elastomeric Bearings & Integral Abutments Steel Bridge - Economy

  50. Weathering Steel Steel Bridge - Economy