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