Bridges : History, Forces, & Types
History <ul><li>The first bridges consisted of fallen logs over rivers. </li></ul>
History <ul><li>The development of rope allowed people to build primitive suspension bridges. </li></ul><ul><li>You can se...
I guarantee you have all been on one
<ul><li>Isn’t this the same thing? </li></ul>
Who Designs them? <ul><li>A  Civil Engineer  is a person who designs bridges </li></ul><ul><li>Civil Engineers must be str...
Forces <ul><li>Tension : A force that tries to stretch material and pull it apart </li></ul><ul><li>Compression : A force ...
More Forces <ul><li>Shear : A force that tries to make materials tear and slide by each other </li></ul><ul><li>Torsion : ...
What happens when there is too much force on a bridge?
Beam Bridge Tension Compression
Truss Bridge Changes as the load moves across the bridge Tension Compression
Arch Bridge Tension Compression
Suspension   Bridge Tension Compression
Cable-Stay   Bridge Tension Compression
Review
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Bridges: history, forces, and types

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The slide show describes the forces that act on a bridge and give examples of types of bridges

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Bridges: history, forces, and types

  1. 1. Bridges : History, Forces, & Types
  2. 2. History <ul><li>The first bridges consisted of fallen logs over rivers. </li></ul>
  3. 3. History <ul><li>The development of rope allowed people to build primitive suspension bridges. </li></ul><ul><li>You can see examples of this type of bridge in many movies. </li></ul>
  4. 4. I guarantee you have all been on one
  5. 5. <ul><li>Isn’t this the same thing? </li></ul>
  6. 6. Who Designs them? <ul><li>A Civil Engineer is a person who designs bridges </li></ul><ul><li>Civil Engineers must be strong in math and science to be able to properly design a bridge </li></ul>
  7. 7. Forces <ul><li>Tension : A force that tries to stretch material and pull it apart </li></ul><ul><li>Compression : A force that tries to push or squeeze material together </li></ul>
  8. 8. More Forces <ul><li>Shear : A force that tries to make materials tear and slide by each other </li></ul><ul><li>Torsion : A Force that tries to twist and bend materials </li></ul>
  9. 9. What happens when there is too much force on a bridge?
  10. 10. Beam Bridge Tension Compression
  11. 11. Truss Bridge Changes as the load moves across the bridge Tension Compression
  12. 12. Arch Bridge Tension Compression
  13. 13. Suspension Bridge Tension Compression
  14. 14. Cable-Stay Bridge Tension Compression
  15. 15. Review
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