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What is the key purpose of a roof?

What is the key purpose of a roof?. Why are there so many different styles of roof?. Tensile and Compression Force. Tension The rope is under tension as the two people pull on it. This stretching puts the rope under tension. Compression

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What is the key purpose of a roof?

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  1. What is the key purpose of a roof?

  2. Why are there so many different styles of roof?

  3. Tensile and Compression Force Tension The rope is under tension as the two people pull on it. This stretching puts the rope under tension. Compression Weightlifters find that their body is compressed by the weights they are holding above their head.

  4. Basic structural elements All structures have forces acting on them. The part of the structure that has a tensile force acting on it is called a TIE. The part that has a compressive force acting on it is called a STRUT.

  5. Roof design The roof beams are under pressure from the weight of the tiles on the roof (compressive force). The ceiling beam is being stretched (tensile force).

  6. Tension or compression? Identify which members are in tension or compression http://commons.wikimedia.org/wiki/File:Ironbridge002.JPG

  7. Tension or compression? Identify which members are in tension or compression http://benjaminwey2000.files.wordpress.com/2008/01/calatrava.jpeg

  8. Tension or compression? Identify which members are in tension or compression http://www.unm.edu/~fll/eiffel-tower-day.jpg

  9. Tension or compression? Identify which members are in tension or compression http://www.fosterandpartners.com/content/projects/0300/4740.jpg

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