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BRIDGES PowerPoint Presentation

BRIDGES

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BRIDGES

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  1. BRIDGES Study Guide

  2. Load- the weight on a bridge • Dead load- bridge parts • Live load- cars and pedestrians on the bridge • Cable – provides structure for cable stayed or suspension. Holds decking in place. • Tower- Vertical structure from which cables are hung

  3. Abutments- outermost end supports on a bridge which carry load on deck • Anchorages- a secure fixing (concrete) to which cables are fastened • Decking- roadway on a bridge • Span- the distance between two supports. • Piers- pillar/vertical support below a beam bridge to give bridge more stability

  4. Truss- triangular shape, strongest and most stable shape • Shear- force that slides • Compression- force that presses together • Tension- force that pulls apart • Torsion- force that twists

  5. Be able to compare and contrast the following bridges

  6. Compression in decking, tension in piers Beam Bridge

  7. Compression in arch Arch Bridge

  8. Compression in towers and decking, tension in cables Suspension Bridge

  9. TRUSS BRIDGES

  10. Reinforced Concrete and steel are both strong in compression and tension. Concrete and wood are only strong in compression. They are weak in tension so reinforced concrete and steel would be the best materials to build a bridge with. • http://www.pbs.org/wgbh/buildingbig/lab/materials.html Best materials to make a bridge with…

  11. http://science.howstuffworks.com/29833-understanding-tacoma-narrows-bridge-video.htmhttp://science.howstuffworks.com/29833-understanding-tacoma-narrows-bridge-video.htm • Adding steel trusses to the underside of the bridge makes the bridge more rigid. It also makes it more aerodynamic. Galloping Gertie