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Short span prebricated county bridge standards

Concept Development. Short span prebricated county bridge standards. Key Considerations. Prefabricated system to accelerate construction Prestressing only in spans where required Preference for only one beam width Prefabricated or modular abutments Use SL-1 Steel Barrier Rail

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Short span prebricated county bridge standards

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  1. Concept Development Short span prebricated county bridge standards

  2. Key Considerations • Prefabricated system to accelerate construction • Prestressing only in spans where required • Preference for only one beam width • Prefabricated or modular abutments • Use SL-1 Steel Barrier Rail • Minimize weight of components (<45,000 Lbs.) • Preference to avoid transverse post-tensioning • 24’ & 30’ Road widths; Spans from 30’ – 70’ • 0, 15, & 30 degree skews

  3. What systems are currently being used? • Internet search of State DOT Standards • Input from other regional HDR offices

  4. What are other viable or new systems? • Internet Search • DOT Scanning Tour Results

  5. Predominant Systems • Precast/Prestressed Concrete Voided Slabs • Precast/Prestressed Concrete Box Beams • Precast/Prestressed Deck Bulb T Beams • Precast/Prestressed Double T Beams • Precast/Prestressed Inverted T Beams

  6. Construction Considerations • Differential Camber (prestressed members) • Reflective Cracking • Code Recommended Transverse Post –tensioning • Topping / Wearing Surface • Barrier Rail Connection • Skew Effects • Accommodation of Roadway Crown • Parallel Wing Abutments

  7. Proposed System (Precast Abutments)

  8. Proposed System (Steel Abutments)

  9. Lab Testing Phase • Connection of SL-1 Steel Rail • Transverse Post-tensioning for crowned roadway Additional Analysis • Parametric Study of conventionally reinforced vs. prestressed beam span limits

  10. Discussion: • Transverse connection • P/T vs. hand tightened tie rod? • Level of transverse contact force? • Keyway configuration? • Keyway grout or UHPC? • Topped or untopped? (differential camber)

  11. Discussion: • Abutment Details • End diaphragm as backwall? • Anchorage of boxes to integral abutment? • 3 vs. 4 bearing pads? • Accommodation of roadway crown

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