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Innovative Precast Bridge System

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Tamer Osman, P.E., Senior Project Manager, Delta Engineers, Architects & Land Surveyors, PC

Published in: Engineering
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Innovative Precast Bridge System

  1. 1. Simple, Economic and Fast Solution for Bridge substructures. Innovative Precast System For Short Spans and Low Volume Bridges
  2. 2.  Year Built : 1950  Primary Owner : Town  Steel Stringers  Timber Deck  Span Length : 30 feet  Out to Out Width : 23.6 feet  Skew Angle : 30 Degrees  Abutment Height : 14 Feet  AADT : 57  Posted for 5 Tons  Founded on Spread Footers Bridge Data Innovative Precast System For Short Spans and Low Volume Bridges Case Study in NY
  3. 3. Existing Conditions Innovative Precast System For Short Spans and Low Volume Bridges
  4. 4. Bridge Replacement Alternatives  Four Sided Structure  Three Sided Structure ( Box or Arch)  Integral Abutment with Prestressed Beams Superstructure  Non Conventional System Innovative Precast System For Short Spans and Low Volume Bridges
  5. 5. Types of Concrete Abutments  Cantilever Abutments  Integral Abutments  Abutments Founded on Piles  Non Conventional System Innovative Precast System For Short Spans and Low Volume Bridges
  6. 6. Cantilever Abutments  Abutment Stem  Abutment Backwall  Abutment Footings Design Forces Main Components  Earth Lateral Pressure  Loads From Superstructure  Bearing Capacity Innovative Precast System For Short Spans and Low Volume Bridges
  7. 7. How it Works ? Factors Affect the Footing Dimensions:  Toe and Heel Widths are Determined by The Sliding and Overturning Forces  The Footing Area is Determined by the Bearing Capacity Constraints  The Footing Thickness and Reinforcement are Determined by The Base Pressure (Shear and Flexure) Innovative Precast System For Short Spans and Low Volume Bridges
  8. 8. Factors Affect the Stem Dimensions:  Stem Thickness is Determined by Flexural forces Resulted from Earth Pressure  Reinforcement is Determined By the Flexural Forces  Bridge Seat Requirements May Determine the Thickness of the Stem Which Results in Excessive Concrete Volume Innovative Precast System For Short Spans and Low Volume Bridges
  9. 9. Cantilever Abutments  Conventional System, Easy To Construct and Design  Suitable For Most Soil Conditions (Rock or Shale )  Can be Used With Any Skew Cons Pros  Not Suitable For Poor Soils  Requires Large Amount of Concrete  Requires Large Quantity of Reinforcement  Requires Large Volume of Excavation  Requires a Deck Joint Innovative Precast System For Short Spans and Low Volume Bridges
  10. 10. Integral Abutments  Abutment Stem  Deep Foundations (Piles) Main Components Design Forces  Earth Lateral Pressure  Loads From Superstructure  End Bearing Capacity or Skin Friction Capacity Innovative Precast System For Short Spans and Low Volume Bridges
  11. 11. How it works ? Factors Affect the Abutment Dimensions:  Stem Thickness is Determined by Flexural forces Resulted from Earth Pressure  Reinforcement is Determined By the Flexural Forces  Bridge Seat Requirements May Determine the Thickness of the Stem Which Results in Excessive Concrete Volume Innovative Precast System For Short Spans and Low Volume Bridges
  12. 12. Integral Abutments  NYSDOT Preferred Abutment Type  Jointless Bridge System  Less Concrete and Reinforcement Than the Gravity Abutments  Fast Construction Time Compared to Gravity AbutmentCon s Pros  Not Suitable For All Soil Conditions  Not Suitable For Large Skews  Requires Deep Foundation  Costs More Than Gravity Abutments Innovative Precast System For Short Spans and Low Volume Bridges
  13. 13. Precast Abutment System  Pre-Cast Concrete Cap  Pre-Cast Concrete Lagging  Pre-Cast Concrete Footings  H-Piles Embedded In Concrete Footings Design Forces Main Components  Earth Lateral Pressure  Loads From Superstructure  Soil Parameters Innovative Precast System For Short Spans and Low Volume Bridges
  14. 14. How It Works The System Consist of The Following:  Pre-Cast Lagging: Designed to Retain The Soil and Resist Lateral Forces from Soil  H-Piles: Designed to Carry the Cap Beam Which Carries The Super Structure  Precast Footings: Designed to Distribute the Load to The Bearing Stratum  Mechanical Couplers: Connects The Units Together Innovative Precast System For Short Spans and Low Volume Bridges
  15. 15. Design Forces Factors Affect the Footing Dimensions:  Toe and Heel Dimensions are Determined by The Sliding and Overturning Forces  The Footing Area is Determined by the Bearing Capacity Constraints  The Footing Thickness and Reinforcement are Determined by The Base Pressure (Shear and Flexure) Innovative Precast System For Short Spans and Low Volume Bridges
  16. 16. Precast Abutment System  Simple and Flexible Design  Easy To Handle and Install  Small Sections Compared to Conventional Design  Fast Construction Time  Economic Design  Concrete Cap To Accommodate Bridge Seat Requirements  Can Be Installed with Mid Size Excavator Cons Pros  Aesthetics Innovative Precast System For Short Spans and Low Volume Bridges
  17. 17.  Pre-Cast Abutment System  Pre-Stress Pre-Cast Beams The Preferred Alternative Innovative Precast System For Short Spans and Low Volume Bridges
  18. 18. Construction Phase Innovative Precast System For Short Spans and Low Volume Bridges
  19. 19. Questions ? Innovative Precast System For Short Spans and Low Volume Bridges

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