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Physics of the Bridge

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by

Nina Ekblad

on 22 May 2011

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Transcript of Physics of the Bridge

Compression - a force that tends to shorten or squeeze something; decreasing its volume Tension - a force or combination of forces exerting such a pull against the resistance of the material Definitions and Applications Plasticity - the property of material to be deformed repeatedly without rupture by the action of a force, and remain deformed after the force is removed. Elasticity - the property of returning to an initial state or form after deformation Where did our bridge break? Why did our bridge break? Source: http://www.learner.org/jnorth/tm/spring/Muscles.html Source:http://en.wikipedia.org/wiki/Plasticity_(physics) Our bridge broke along the corner of the block, at a point that lacked extra glue and cardboard reinforcements Before it broke, our bridge twisted and warped around the area that held the weight As the weight on the roadbed got heavier, our bridge began to bend The top of the roadbed experienced compression,
and the bottom of the roadbed experienced tension The Physics Behind the Bridge By Brita and Nina
May 11, 2011
Physics 12 Our bridge broke along the bottom. This makes it clear that cardboard performs better under compression than tension This is another photo showing the two main areas where our bridge broke or became deformed The corner of the block rested on an area of the roadbed that had minimal support Would have been stronger if the block had rested on one of the corners of one of the triangles Caused compression Tension along the bottom caused the roadbed to split in an area with minimal reinforcement Methow River Bridge Winthrop, WA Source: www.flickr.com This truss bridge was built in 1929
and rehabilitated in 1950 As more and more weight was added, our bridge
had plasticity; meaning it swayed under
the force of the weight. It remained deformed after the weight was removed. Originally green - recently repainted Average daily traffic: 4,570 vehicles Since our bridge was made from cardboard,
it did not demonstrate the characteristic of
elasticity, or ability to return to its original form Improvements in Design Could include additional
vertical supports inside the beam in areas lacking reinforcement An "accordian" interior support system higher in frequency would strengthen the bridge because it would provide a greater surface area in contact with roadbed Photos of Winthrop around the time the Methow River bridge was rehabilitated Once cardboard bends, it weakens and is unable to return to its original strength Could have used more glue to reinforce joints and less to reinforce areas that were already fairly secure http://www.wsdot.wa.gov/environment/culres/bridges.htm Source: http://www.britannica.com/EBchecked/media/18375/A-single-span-truss-bridge-with-forces-of-tension-represented Source:http://www.britannica.com/EBchecked/media/18375/A-single-span-arch-bridge-with-forces-of-tension-represented Source:http://www.britannica.com/EBchecked/media/18375/A-single-span-suspension-bridge-with-forces-of-tension-represented The End Bibliography http://www.britannica.com/EBchecked/topic/130290/compression http://www.thefreedictionary.com/tension http://dictionary.sensagent.com/plasticity+%28physics%29/en-en/ http://www.thefreedictionary.com/elasticity http://en.wikipedia.org/wiki/Truss_bridge
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