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Public Infrastructure

Public Infrastructure. Bridges. Bridges. What bridges do How do you design a bridge? Types of bridges. What Bridges Do. Cross over a natural obstacle River/creek Canyon/valley Cross over a man-made facility Road Railroad Canal. How Do You Design Bridges?.

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Public Infrastructure

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  1. Public Infrastructure Bridges

  2. Bridges • What bridges do • How do you design a bridge? • Types of bridges

  3. What Bridges Do • Cross over a natural obstacle • River/creek • Canyon/valley • Cross over a man-made facility • Road • Railroad • Canal

  4. How Do You Design Bridges? • For most of history: Trial & error • Beginning in 1800’s: Structural engineering • Today: Use computers to model bridges & performance • Bridge engineers need to understand physics, materials, construction methods, math

  5. How Do You Design a Bridge? • Safety • Carry intended loads • Economy • Construction cost • Maintenance cost • Esthetics • How it looks • How it fits in to surrounding neighborhood

  6. Compression • Tension Bridge Forces • How are forces resisted? • Transfer • Dissipation

  7. 3 Basic Types of Bridges • Beam bridge • Up to 200 feet • Arch bridge • Up to 800 feet • Suspension bridge • Up to 7,000 feet

  8. The first bridges Logs across a stream Simple Cheap Need strong materials Beam Bridges

  9. Beam Bridge

  10. Beam Bridge Transfer of Force

  11. Ancient design Can last a long time Expensive & hard to build Arch Bridges

  12. Arch Bridge

  13. Arch Bridge Dissipate Force

  14. Suspension Bridges • Can bridge long distances • Wide, high, clearances

  15. Suspension Bridge

  16. Suspension Bridge Transfer of Force

  17. Cable-Stayed Bridges

  18. Truss Bridges • Use wood or steel to make triangles • Early railroad bridges

  19. Cantilever Bridges

  20. Box Girder Bridges

  21. Box Girder Sections • Concrete • Steel composite with concrete • Polymer composites

  22. Smallest Usually carry water under roads Culverts

  23. Movable Bridges

  24. Covered Bridges

  25. Date of Construction of US Bridges

  26. Chicago Skyway • Opened 1958 • 7.8 miles • Current $250 million renovation

  27. Chicago Movable Bridges • Types • Vertical lift • Swing • Bascule • Different types • Many designs developed in Chicago • 52 movable bridges in Chicago today • Some immobilized

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