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Let’s Learn About Bridges

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Let’s Learn About Bridges. Simplest bridge form A log across a street was the earliest form of a beam bridge Consists of a horizontal beam supported at each end by a pier The weight of the beam pushes down on the piers The farther apart the piers, the weaker the beams

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Presentation Transcript
beam bridge

Simplest bridge form

  • A log across a street was the earliest form of a beam bridge
  • Consists of a horizontal beam supported at each end by a pier
  • The weight of the beam pushes down on the piers
  • The farther apart the piers, the weaker the beams
  • Beams can be placed at points other than the beginning and end
  • Usually these bridges are not longer than 250 feet.

Horizontal Beam

Beam Bridge

Pier

beam bridges

Why are these bridges a good idea….

  • Usually pretty easy to build
  • Inexpensive when compared to other bridge types
  • Can be used in rural or urban areas
  • Why are these bridges not such a good idea….
  • Ships cannot go under them
  • Construction not attractive
  • Costly if many piers are needed
  • Concrete used is cheaper but not as strong as steel
Beam Bridges
truss bridge

Made of a series of triangles

  • One of the oldest types of bridges
  • A flat bridge is laid and then supports are built on both sides in triangle shapes both above and below the flat bridge
  • Can be any length
  • Many are railroad bridges
Truss BRidge
truss bridge2

Why are these bridges a good idea….

  • Very strong
  • Can support heavy loads
  • Made or steel
  • Economical to build
  • Easy to build and design
  • Why are these bridges a bad idea…
  • Difficult to construct
  • Take a lot of time and money to repair
  • Difficult to widen the bridges
  • Not very attractive
Truss Bridge
arch bridge

Difficult to build

  • Built a long time ago by the Romans
  • One of the most popular types of bridges
  • Different styles of arches can be used
  • Some of these bridges were built using stone and have stood the test of time
Arch Bridge
arch bridge2

Why are these bridges a good idea…

  • Can be made from a wide range of materials including wood, stone, concrete, and steel
  • Considered attractive
  • strong
  • Why are these bridges not such a good idea….
  • Expensive to build
  • Limited to where can be placed because ground needs to be strong enough to support it
Arch Bridge
suspension bridge

These bridges can span 2,000 to 7,000 feet -- much farther than any other type of bridge!

  • Cables are hooked on vertical suspenders that support the road.
  • Found in harbors with lots of boat traffic.
  • Usually longer than other types of bridge.
Suspension Bridge
suspension bridge2

Why are these bridges a good idea…

  • Very strong
  • Can span long distances
  • Attractive
  • Allow boats and ship traffic to pass under them
  • May withstand earthquakes better than other kinds of bridges
  • Why are these bridges not such a good idea….
  • Expensive
  • Long time to build
  • Require large amounts of material
Suspension Bridge
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