Basics of bridge construction


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  • @kianadouglas75 u r soo sexy
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  • How much did it weight? I'm doing a similar project but it is based upon a weight to amount held ratio and if your bridge fulfills those limitations I could chuck my 1st one which didn't go over all that well.
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Basics of bridge construction

  1. 1. Basics of Bridge Construction Build a Spaghetti Bridge Project Photo Journal <ul><li>Created By </li></ul><ul><li>**** ****** </li></ul><ul><li>April 2008 </li></ul>
  2. 2. Planning <ul><li>8 Processes of Engineering  </li></ul><ul><li>Identify the Problem This problem was given Build a bridge out of Spaghetti. </li></ul><ul><li>Span between 20 and 30 inches </li></ul><ul><li>Wide enough to allow a 2 x 4 flat to pass unimpeded through all supports. </li></ul><ul><li>Able to support 15 lbs at any point along deck </li></ul><ul><li>Research the Problem What makes a bridge strong </li></ul><ul><li>Develop Possible Solutions </li></ul><ul><li>Select Best Solution  </li></ul><ul><li>Construct a Prototype </li></ul><ul><li>Test and Evaluate  </li></ul><ul><li>Redesign </li></ul><ul><li>Communicate Solution </li></ul>
  3. 3. The Challenge <ul><li>Challenge </li></ul><ul><li>Research , design, build and revise: </li></ul><ul><li>A bridge using only spaghetti and hot glue </li></ul><ul><li>Bridge span should be approximate 20 -30 inches </li></ul><ul><li>Bridge base must be smooth enough for 2x4 to pass through unimpeded </li></ul><ul><li>Bridge should support 15 lbs at any point on deck </li></ul>
  4. 4. Step 1 Research <ul><li>Interactive lessons from PBS Building Big </li></ul><ul><li>1 st Bridge Basics exercise </li></ul><ul><li>at </li></ul><ul><li> </li></ul><ul><li>2 nd The Bridge challenge </li></ul><ul><li> </li></ul><ul><li>3 rd Forces Lab Exercise </li></ul><ul><li> </li></ul><ul><li>Watch History Channel/National Geographic True Story of the Bridge of River Kwai </li></ul>
  5. 5. Step 2 Design Bridge <ul><li>Choice Warren Truss bridge </li></ul><ul><li>Looked Sturdy and seemed to be able to be built with Spaghetti and hot glue </li></ul><ul><li>Need to calculate the length of the span, height of trusses, width of roadbed </li></ul><ul><li>Decide on how many pieces of spaghetti would be used in one bridge section </li></ul>
  6. 6. Step 3 Begin Construction <ul><li>Prototype 1 </li></ul><ul><li>Follow design and construct first truss </li></ul><ul><li>Double check that all sections are right length and same number of spaghetti in each </li></ul><ul><li>Place sections in triangles and begin gluing in proper places </li></ul><ul><li>Do not use excessive amounts of glue </li></ul>
  7. 7. Prototype Construction The trusses <ul><li>Prototype 1 </li></ul><ul><li>Construct 1st truss </li></ul>
  8. 8. Prototype Construction The trusses <ul><li>Prototype 1 </li></ul><ul><li>Construct 2 nd truss </li></ul>
  9. 9. Prototype Construction Step 4 begin construction of base <ul><li>Prototype 1 </li></ul><ul><li>Measure lengths and count number of spaghetti pieces in each section </li></ul><ul><li>Place longer sections on bottom and shorter sections on the top </li></ul><ul><li>Glue and let sit to dry </li></ul>
  10. 10. Prototype Construction Step 5 Finish construction <ul><li>After all the different pieces of the bridge have finished drying its time to finish the prototype </li></ul><ul><li>First you must place a road bed on the base </li></ul><ul><li>Put the trusses on the base and glue and let set </li></ul><ul><li>Then place the cross braces at the top of the trusses for a bit more support </li></ul><ul><li>Let set for awhile </li></ul>
  11. 11. Step 5 Finish Construction <ul><li>Completed Prototype </li></ul><ul><li>End view </li></ul>
  12. 12. Prototype Construction Step 5 Finish Construction <ul><li>Completed Prototype </li></ul><ul><li>Side view </li></ul>
  13. 13. Step 6 Test Prototype for problems <ul><li>After the glue has set, check the bridge for potential problems </li></ul><ul><li>The trusses were not all the same height </li></ul><ul><li>The base was not strong enough </li></ul><ul><li>There was a noticeable curve </li></ul>
  14. 14. Step 7 Redesign Bridge <ul><li>When redesigning the bridge make sure that all the problems with the Prototype were fixed </li></ul><ul><li>Decide if change needs to be made in order of construction </li></ul>
  15. 15. Final Product Construction Step 8 Measure and Cut <ul><li>Correcting my first error, not every piece of spaghetti is the same length </li></ul><ul><li>Correction </li></ul><ul><li>Measure each piece of Spaghetti and cut to proper lengths </li></ul>
  16. 16. Final Product Construction Step 9 Trusses <ul><li>Correcting 2 nd error; not all triangles were the same size </li></ul><ul><li>When constructing the trusses measure out the points for all the triangles to meet the beams. </li></ul><ul><li>Glue and let set </li></ul>
  17. 17. Final Product Construction Step 10 Base <ul><li>Correcting 3 rd error </li></ul><ul><li>Base was curved and did not lay flat </li></ul><ul><li>The glue on each piece must set and then be trimmed to allow bridge deck to be flat and level </li></ul>
  18. 18. Final Product Construction Step 11 2 nd layer added to base <ul><li>The bridge must hold 15 lbs at any point on the deck. </li></ul><ul><li>To give the deck added strength a complete layer of spaghetti was added to the base running perpendicular to the beams and future deck. </li></ul>
  19. 19. Final Product Construction Step 12 Assemble structure
  20. 20. Project Completion ( almost) <ul><li>Now all that was left was to trim decking to square. </li></ul>
  21. 21. Project Completion <ul><li>End View </li></ul>
  22. 22. Project Completion <ul><li>Side view </li></ul>
  23. 23. Project Completion <ul><li>Overhead view </li></ul>
  24. 24. Final Testing <ul><li>Spanning 2 Chairs </li></ul>
  25. 25. Testing Bridge Strength <ul><li>I borrowed 2 weights from a local hardware store </li></ul>
  26. 26. Testing Bridge Strength <ul><li>10 lbs </li></ul><ul><li>No Problem! </li></ul>
  27. 27. Testing Bridge Strength <ul><li>15 lbs </li></ul><ul><li>I did it! </li></ul>
  28. 28. Communication <ul><li>Presentation of Photo Journal </li></ul><ul><li>Created using Microsoft Powerpoint </li></ul><ul><li>Piccasa 2 Photo Editor </li></ul><ul><li>Thanks to: </li></ul><ul><li>PBS: Build Big </li></ul><ul><li> </li></ul><ul><li>Price Of Freedom : True Story of The Bridge on River Kwai  </li></ul><ul><li>Unschooler’s Engineering Club </li></ul><ul><li>2007 – 2008 </li></ul>