1 / 12

Accelerated Bridge Construction with Prefabricated Systems

Explore precast and prestressed bridge standards, key considerations, and construction methods for efficient, durable county bridge projects. Includes analysis of various bridge systems, lab testing, and construction considerations.

roxannebeal
Download Presentation

Accelerated Bridge Construction with Prefabricated Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related