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Bridges

Bridges. 8 th Grade Science Butler Middle School Lowell, MA. Bob, Paul and Ms Adams April 24, 2012. Definition of a Bridge. A structure spanning and providing passage over a gap or barrier, such as a river, road, railway or some other obstacle. Basic Types of Bridges. Beam

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Bridges

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  1. Bridges 8th Grade ScienceButler Middle SchoolLowell, MA Bob, Paul and Ms AdamsApril 24, 2012

  2. Definition of a Bridge • A structure spanning and providing passage over a gap or barrier, such as a river, road, railway or some other obstacle.

  3. Basic Types of Bridges Beam Common on Interstate Highways Arch Very Strong Suspension Can be quite long and high Roadway hangs from cables Can tolerate some movement in high wind

  4. Bridge Forces Compress Tension Bend Torsion Shear (squeeze) (stretch) (twisting) (cutting)

  5. What kind of Forces? Tension, Pulling Apart Compression, Squeeze

  6. Bending, Tension, Compression Compression Tension

  7. Forces that can damage a Bridge Torsion - Twisting Bending - Pushes two ends of an object in same direction

  8. Shearing Forces can also damage a Bridge Shear - Pushes in opposite directions within the material

  9. 3 Spans across Merrimack River, Lowell, MA

  10. Forces in a Beam Bridge Bending, Compression and Tension Compression Forces Tension Forces Reaction Load Reaction

  11. Green St. Bridge over Concord River, Lowell, Ma

  12. Arch Bridge Forces Compression Forces Reaction Load Reaction

  13. Suspension Bridge Golden Gate, San Francisco, Ca. Tension Forces Load Reaction Reaction

  14. Newport, RI

  15. Tyngsborough, Ma. Merrimack River

  16. Bridge Street Bridge is a Truss Bridge

  17. Bridge Street Bridge, Lowell, Ma Which geometric shape is most noticeable and why?

  18. Triangle vs Rectangle Flexible (can change its shape) Rigid

  19. University Ave Bridge, Lowell Ma Summer April 9, 2009

  20. Paper Bridge Challenge Make a Bridge using 4 sheets of paper and a little tape

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