Bridge slideshownew

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Bridge slideshownew

  1. 1. Click mouse to advance each slide.
  2. 2. There are threeThere are three major types ofmajor types of bridges...bridges... 3
  3. 3. 3 Main3 Main BridgeBridge TypesTypes:: •Beam BridgeBeam Bridge •Arch BridgeArch Bridge •Suspension BridgeSuspension Bridge
  4. 4. The biggest difference between the three bridge types is the distances they can each cross in a single span. A span is the distance between two bridge supports.
  5. 5. Beam bridges usually coverBeam bridges usually cover relatively short distances.relatively short distances.
  6. 6. As beam bridges are lengthened, theyAs beam bridges are lengthened, they need more supporting piers.need more supporting piers. But adding piers makes themBut adding piers makes them unsuitable if a lot of space is neededunsuitable if a lot of space is needed underneath them.underneath them.
  7. 7. Many elevated roadways areMany elevated roadways are beam bridges.beam bridges.
  8. 8. A beam bridge spans short distances...
  9. 9. …or beam bridges can be connected to cover long distances.
  10. 10. Beam bridgesBeam bridges must resistmust resist bending forcesbending forces
  11. 11. A truss may be added to a beam to help resist bending forces
  12. 12. A truss is a framework formed of triangles that provide strength. A truss is lightweight and allows wind to pass through.
  13. 13. Often the truss is added to the top of the beam
  14. 14. The angled piers of this beam bridge transfer its loads to the ground.
  15. 15. AA Cantilever BeamCantilever Beam bridgebridge has triangular structureshas triangular structures that weigh down each endthat weigh down each end of the beams.of the beams.
  16. 16. Cantilever bridges are expensive, because they require a large amount of materials.
  17. 17. The Firth of Forth Cantilever Bridge Scotland
  18. 18. Stone arch bridges have been built for thousands of years.
  19. 19. Stone arch bridges cross short spans, and compression helps them keep their shape.
  20. 20. Arch bridges are also built with steel.
  21. 21. The steel arch structure provides the strength for the span, and allows
  22. 22. Smaller arches can be used as abutments.
  23. 23. An arch can also be anchored into a canyon, and then the deck is placed on top.
  24. 24. Anchors placed in solid soil keep the base of the arch from spreading.
  25. 25. Suspension Bridges are the most spectacular of all.
  26. 26. The Tacoma Narrows Suspension Bridge. A Famous Engineering Failure.
  27. 27. The New Tacoma Narrows Bridges.
  28. 28. The Golden Gate Suspension Bridge Notice the trusses under the deck that allow the wind to pass through.
  29. 29. The Golden Gate Suspension Bridge Under Construction
  30. 30. Another kind of suspension bridge is a Cable-Stayed Bridge.
  31. 31. The New Cable-Stayed Bridge in Boston. The Zakim Bunker Hill Bridge
  32. 32. A Cable-Stayed Bridge Under Construction.
  33. 33. Identify the parts of a suspension bridge: • Twin Towers • Main Cable • Cable Anchorages • Deck/Roadway • Suspenders • Tower Anchors
  34. 34. Identify these bridge types...
  35. 35. a. Suspension Bridge b. Arch Bridge c. Beam Bridge d. Cable-stayed
  36. 36. a. Suspension Bridge b. Arch Bridge c. Beam Bridge d. Cable-stayed Bridge
  37. 37. a. Suspension Bridge b. Arch Bridge c. Beam Bridge d. Cable-stayed Bridge
  38. 38. a. Suspension Bridge b. Arch Bridge c. Beam Bridge d. Cable-stayed Bridge
  39. 39. a. Suspension Bridge b. Arch Bridge c. Beam Bridge d. Cable-stayed Bridge
  40. 40. a. Suspension Bridge b. Arch Bridge c. Beam Bridge d. Cable-stayed Bridge
  41. 41. a. Suspension Bridge b. Arch Bridge c. Beam Bridge
  42. 42. The End

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