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BRIDGES

Explore the fascinating history of bridge construction, from primitive log and rock bridges to modern steel and concrete structures. Learn about different types of bridges, such as beam, truss, and arch bridges, and the materials used in their construction. Discover the challenges engineers face in building bridges that can withstand high winds and temperature changes.

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BRIDGES

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  1. BRIDGES Engineer-It Class Summer 2004

  2. History • Primitive Peoples: • Logs • Slabs of Rocks • Intertwined Vines or Ropes • Roman Empire—First Great Bridge Builders • Timber Truss Bridges • Masonry Arch Bridges • Europeans • Followed HRE Until Iron and Steel Use • Nineteenth Century— • Modern Long Bridges • Moveable Bridges

  3. Rock Bridges

  4. Wadi Rum Rock Bridge

  5. View under RainbowBridge, a massive sandstone bridge in Natural Bridges National Monument, Utah, includes a dried up streambed. "RainbowBridge, Utah."

  6. Rope Bridges

  7. Log Bridges

  8. LOG BRIDGE Members of a Denver and Salt Lake Railroad Company (D&SL) survey crew pose on a logbridge over the Colorado River in Gore Canyon (Grand County), Colorado.

  9. View of a settlement in (probably) Utah; shows a logbridge, a stream, and houses. People sit on a porch; a United States flag waves from a pole.

  10. U.S. Army soldiers from the Ohio Engineers, building a small log bridge over a ditch, at Fort Sheridan, Illinois

  11. LOG BRIDGE View of hot springs site enclosed by stone and wooden frame buildings, Hot Sulphur Springs, CO

  12. Covered Bridges

  13. COVEREDBRIDGE • Bridges. Old covered bridge, Jackson River, Va.

  14. Structure of covered bridge. Wallingford, Vermont

  15. Covered Bridge, Glen Canyon, Santa Cruz County, CA

  16. CONSTRUCTION • Must carry own weight and weight of traffic • Must withstand force of high winds • Must consider effects of contraction and/or • Expansion due to temperature changes • Most common materials • Wood—temporary • Steel—for long, strong spans • Reinforced concrete—attractive designs but difficult to work with on large bridges • Prestressed concrete—stronger than reinforced, cheaper than steel

  17. TYPES OF BRIDGES • Fixed • Moveable • Other

  18. Beam or Girder Bridges

  19. FIXED • Beam or Girder • Two parallel beams w/ flooring supported by piers • Span can be supported by trestle • Used for hwy over/underpasses or small stream crossings • Example—Covered Bridge

  20. Cars on a suspension bridge over a river, possibly in Colorado.

  21. enz_bridge.jpg

  22. Millennium Bridge, London

  23. ostruz.jpg www.prevodi-vertalingen.com/.../ ostruz.html

  24. Truss Bridges

  25. FIXED • Truss • Beam bridge strengthed by trusses (structural spts joined to form triangles with tie rods) • Lighter than ordinary beam sections of equal length • Useful for longer bridges

  26. Timber Truss Bridge

  27. Continuous Truss Bridges

  28. View west of an iron trussbridge crossing the Colorado River on the Denver and Rio Grande Railroad Montrose line at Grand Junction, Colorado; people and horses are on a sand bar.

  29. View of the bridge crossing the White River at Meeker, CO on the Mesa and Flag Creek road.

  30. White Water Creek Bridge, Spanning White Water Creek, Bernard vicinity, Dubuque County, IA

  31. Truss Bridge View of a trestle bridge that crosses Arastra Gulch near Silverton (San Juan County), Colorado.

  32. Jefferson Barracks BridgeLocation: Mississippi River, Jefferson Barracks, Missouri

  33. Simple Truss Bridges

  34. FAI 24 Bridge Over the Ohio RiverPaducah, Kentucky www.modjeski.com/projects/ servproj/paducah.htm

  35. Ohio River ferry and railroad bridge, Metropolis, IL

  36. Arch Bridges

  37. FIXED • Arch • One or more arches • Masonry, reinforced concrete or steel • Roadway on toop of arches or suspended by cables • Spans can be longer than beam or truss

  38. Aquaduct

  39. Old stone bridge at Bull Run Battlefield. Manassas, Virginia.

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