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Standard Design and Details ofPress-Brake-Formed Steel Tub Girder

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General Notes

SPECIFICATIONS:Specifi cations for design, materials, and construction are included in the following:

• AASHTO LRFD bridge design specifi cations, fi fth edition with 2010 interim revisions. 2010. Adopted and published by the American Association of State Highway and Transportation Offi cials. Washington, DC

• AISC Manual of Steel Construction Load & Resistance Factor Design, Published by the American Institute of Steel Construction, Inc

• ASTM Standards. Published by the American Society for Testing and Materials. ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 USA

• Evaluation of Prefabricated Composite Steel Box Girder System for Rapids Bridge Construction, Research report by Michigan State University for the Michigan Department of Transportation.

DESIGN LOADING:AASHTO HL-93 Vehicular Live Loading.

Average Daily Traffi c (ADT) 500.

Future Wearing Surface of 13 psf

DESIGN METHOD:AASHTO Load and Resistance Factor Design (LRFD)method was employed throughout. Designs wereoriginated using standardized composite precastprefabricated cold formed steel girders. Designs willaccommodate skews up to 45° from perpendicular.

STRUCTURAL STEEL:All structural steel shall conform to AASHTO M270 (ASTM A572) grade 50, as applicable. Refer to “Design Method”.

CONCRETE:Precast concrete for deck shall have a minimum 28-day compressive strength (f’c) of 6,000 PSI

CONCRETE DECK:The deck thickness employed for design was 8”. The owner shall specify the required deck cross slope and grade.

REINFORCING STEEL:Reinforcing steel shall conform to ASTM A615 grade 60.

SHEAR CONNECTORS:Welded stud shear connectors shall conform to therequirements of ASTM A108.

BEARINGS:Bearing pads shall be elastomeric.

Prefabricated Superstructure - Single Girder Unit LayoutThese plans are intented to serve as a guide to state, county and local highwaydepartments in the development of a suitable and economical prefabricated steel bridge superstructure options. The plans should be particularly valuable to the smaller highway departments with limited engineering staff.

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Press-Brake-Formed Girder Sizing Recommendation

Prefabricated Composite Press-Brake-Formed GirderThe selected steel girder is based on typical girder spacing used in the development of the Con-Struct prefabricated bridge standards.

7⁄8”

7⁄8”

NOTES:1. Minimum bend radius (R) shall be per AISC Manual of Steel Construction.

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Fabrication Details

Typical Press-Bake-Formed Girder Details

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1505 44th Street, Suite B SWWyoming, MI 49509PH. (616) 261-8630

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Fabrication Details

Prefabricated Superstructure - Single Girder Unit Layout

NOTES:1. Superstructure may sit on existing bridge seats. Contractor to verify spacing in fi eld.2. Design will accommodate skews up to 45° from perpendicular but are intended to be parallel.3. Station line is intended to be on a tangent alignment.4. Max grade at bearing is – 5%.

45°

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1505 44th Street, Suite B SWWyoming, MI 49509PH. (616) 261-8630

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Fabrication Details

Prefabricated Superstructure - Single Girder Unit Layout

NOTES:1. For shear stud spacing, see Girder Elevations.2. Parapets per state DOT requirements.3. Precast concrete deck shall be transversely tined for fi nal driving surface.

Note: XSL - Cross slope can vary from -.06% to +.06%

7⁄8” 4”