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Disraeli Bridges Rehabilitation

Disraeli Bridges Rehabilitation. Project Description City of Winnipeg Public Works Department. Introduction. Overview - Project Limits - Description of Bridges - Current Condition Assessment - Conceptual Design - Structural Evaluation - Traffic Management During Construction

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Disraeli Bridges Rehabilitation

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  1. Disraeli Bridges Rehabilitation Project Description City of Winnipeg Public Works Department

  2. Introduction Overview - Project Limits - Description of Bridges - Current Condition Assessment - Conceptual Design - Structural Evaluation - Traffic Management During Construction - Public Consultation to Date - Construction Schedule

  3. Project Background & Limits • Opened in 1960 • Roughly 2 km of Road & Bridge • Red River Bridge – 320 m (1050 feet) • CPR Overpass – 390 m (1280 feet)

  4. Disraeli Aerial Overview

  5. Overpass Bridge Elevation

  6. Overpass Cross Section

  7. River Bridge Elevation

  8. River BridgeRiver Spans

  9. River Bridge Land Spans

  10. Original Construction

  11. Disraeli Bridges Rehabilitation Condition Assessment

  12. Maintenance History • Early 1970’s – Open Grid Deck Infilled with Concrete & Asphalt Wearing Surface Installed. Girders were Painted. • 1979 – Concrete Median Barrier Installed • 1984 – Asphalt Wearing Surface Replaced with other Repairs to Structure • 2004 – Concrete Pier Repairs • 2004 – 2008 Structural Steel Deck Repairs

  13. Condition Assessment Components • Bridge / Overpass Structures • Roadways • Geometry • Structural Evaluation • Road & Structure Safety • Pedestrian Safety & Accessibility

  14. Piers / Abutments

  15. Bearings

  16. Girders

  17. Bridge Deck

  18. Sidewalk & Barriers

  19. Geometry • Insufficient Radii on Roadway North of the Bridge and South of the Overpass • Existing On/Off Ramps Do Not Meet Current Geometric Requirements

  20. Geometry

  21. Road & Structure Safety

  22. Pedestrian Safety & Accessibility • Steep, Narrow Sidewalks with Potential Risk of Tripping Hazards • Limited Bicycle Facilities • Lack of Separation from Traffic

  23. Pedestrian Safety & Accessibility

  24. Summary of Deficiencies • Piers/Abutments and Bridge Deck are Severely Deteriorated • Limited Girder Corrosion • Bridge and Roadway Geometry • Universal Design and Overall Accessibility

  25. Disraeli Bridges Rehabilitation Conceptual Design

  26. Design Criteria • Structural Design • CSA-S6 • CL625 Loading & 62.5 T where possible • Geometric Design • TAC Geometric Design Guide • City of Winnipeg Standard Practice • Universal Design • City of Winnipeg Accessible Design Standards

  27. Maintenance Considerations • Zinc-Metallize Girders • Chloride Extraction of Piers & Abutments • Possible Replacement of Select Piers & Abutments • Automated Anti-Icing System

  28. Concept A - Minimum

  29. Concept B Two Sidewalks

  30. Concept C One Wide Sidewalk

  31. Geometry North of Bridge

  32. Red River Bridge

  33. Between Bridges

  34. CPR Overpass

  35. Main Street to Overpass

  36. Structural Evaluation • Original Design Based on 1950’s Codes and Standard Practice • Previous Load Ratings and Load Testing in Late 1970’s and Early 1980’s • Update to Current Design Codes and Truck Loading Where Possible.

  37. Structural Evaluation

  38. Over Height Damage - 2006

  39. Steel Coupons Taken From Damaged Girder and Three Other Locations. Verify the Steel Properties: Meets all requirements of ASTM A373-58T Does not meet current notch toughness requirements for new construction. Modern notch tough steel did not exist until the 1970’s. Physical Testing

  40. Girder Rehabilitation Considerations • 36.5 T posting governed by stress in River Bridge plate girder spans. • Girders have infinite fatigue life at 36.5 T. • Very low ADTT at about 1% of ADT • Structures not fracture critical. • Brittle fracture affected by: • Triaxial state of stress (bad detailing) • Low temperature • Rapid rate of loading

  41. Preliminary Design Findings • Wide flange girder spans can be rehabilitated & strengthened to CL-625 • Not feasible to strengthen river span plate girders to CL-625 or 62.5 T. Options are: • Rehabilitate plate girders and post bridge between 36.5 T and 62.5 T. • Replace plate girder spans. Allows for profile and cross section enhancements.

  42. Disraeli Bridges Rehabilitation Traffic Management During Construction

  43. Impacts on Traffic During Construction • Vehicular Traffic Capacity • Pedestrian & Cyclist Accessibility • Transit & Emergency Services • Trucking Industry • Local Business • Rail and Marine Traffic

  44. Traffic Management Options • Partially Open • Full Closure

  45. Risks Associated With Partially Open Option • Staged Construction • Longer Construction Schedule • Schedule Delays • Vibration-Induced Cracking Due to Traffic

  46. Traffic Management Conclusions • Partially Open option is not practical. • Full Closure option is recommended for traffic management during rehabilitation of the Disraeli Facility. • Further work on a full closure traffic management plan is being undertaken to deal with community access, traffic management, and transit.

  47. Disraeli Bridges Rehabilitation Public Consultation

  48. Public Consultation Process • Key Stakeholder Advisory Committee (SAC) • News Letters • Phone and Mail-in Surveys • Public Open Houses • Report on Findings

  49. Construction Schedule • Construction period estimated at 16 to 24 months. • Limit total bridge closure to 12 to 16 months.

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