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GK12 Review Presentation

GK12 Review Presentation. C.J. DeGroot St. Louis Charter School. Three Units. Designing and Building File-Folder Bridges Build a Model Truss Bridge Test the Strength of Structural Members Analyze and Evaluate a Truss Hazard Mitigation Letter Tsunami Brochure.

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GK12 Review Presentation

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  1. GK12 Review Presentation C.J. DeGroot St. Louis Charter School

  2. Three Units • Designing and Building File-Folder Bridges • Build a Model Truss Bridge • Test the Strength of Structural Members • Analyze and Evaluate a Truss • Hazard Mitigation Letter • Tsunami Brochure

  3. Designing and Building File-Folder Bridges • Brief introduction to engineering • What is engineering? • What do engineers do? • What type of people are engineers? • What different types of engineering exist? • What things do engineers work on? • Types of Engineering

  4. Designing and Building File-Folder Bridges • Learning Objectives: Build a Model Truss Bridge • Identify different types of bridges • Explain what a truss is • Identify the major components of a truss bridge • Identify types of truss bridges • Explain fundamental engineering concepts: • Force, Load, Reaction, Equilibrium, Tension, Compression, Strength • Explain how a truss carries load • Explain the roles of owner, design professional, constructor, project manager • Explain how construction quality affects structural performance

  5. TeachEngineering.org Activity • Tension or Compression? • Write down if the items indicated in the following pictures are in tension or compression

  6. Tension or Compression? 1. Chain of a swing

  7. Tension or Compression? 2. Leg of a swing set

  8. Tension or Compression? 3. Leg of a desk

  9. Tension or Compression? 4. Bike Chain

  10. Tension or Compression? 5. Spoke

  11. Tension or Compression? 6. Arm http://www.healthstylesexercise.com/catalog/images/Perfect-Pushup.jpg

  12. Tension or Compression? 7. Arm http://z.about.com/d/weighttraining/1/0/Z/0/-/-/pullup1.jpg

  13. Tension or Compression? 8. Tennis Ball http://people.rit.edu/andpph/photofile-c/tennis-ball-rebound-2a.jpg

  14. Tension or Compression? 9. Racket Strings http://people.rit.edu/andpph/photofile-c/tennis-ball-rebound-2a.jpg

  15. Tension or Compression? 10. Shoelace http://www.acasports.co.uk/images/products/full/adidas_adipure_sg.jpg

  16. Tension or Compression? 11. Clothes in a full suitcase http://farm2.static.flickr.com/1399/989922244_9c0ed3bf6e.jpg?v=0

  17. Tension or Compression? 12. Kite string http://rick.files.wordpress.com/2008/06/kite_fight.jpg

  18. Tension or Compression? 13. Power lines http://www.liquidmatrix.org/blog/wp-content/uploads/2007/08/powerline.JPG

  19. Tension or Compression? 14. Tripod legs http://www.liquidmatrix.org/blog/wp-content/uploads/2007/08/powerline.JPG

  20. Tension or Compression? 15. Spring http://www.ux1.eiu.edu/~cfadd/1350/08PotEng/Images/8.2.gif

  21. Tension or Compression? 16. Truss member DK

  22. Designing and Building File-Folder Bridges • Learning Objectives: Test the Strength of Structural Members • Calculate cross-sectional area of a member • Describe yielding, rupture, and buckling failure • Explain the factors that affect the tensile strength and compressive strength of a member • Design a testing program to determine the strength of structural members • Explain the principle of the lever and apply it • Determine the tensile strength and compressive strength of structural members experimentally • Use a computer to analyze and graph data

  23. Principle of the Lever • Forces must be balanced • Moment must be balanced around the fulcrum

  24. Tensile Strength Graph

  25. Compressive Strength Graph

  26. Designing and Building File-Folder Bridges • Learning Objectives: Analyze and Evaluate a Truss • Calculate the components of a force vector • Add force vectors • Explain fundamental engineering concepts: • Free body diagram, equilibrium, structural model, symmetry, static determinacy, stability, factor of safety • Use the Method of Joints to calculate the internal force in truss members • Determine the strength of every member • Evaluate a truss to determine if it can safely carry a given load

  27. Add Force Vectors

  28. Add Force Vectors

  29. Add Force Vectors

  30. Method of Joints

  31. Hazard Mitigation Letter • Learned about structural and nonstructural earthquake mitigation (focused on nonstructural) • Learned Mitigation Techniques for: • Computer Equipment - Gas shut-off valves • Hot water heaters - Windows • Pictures and Mirrors - Flexible gas lines • Bookcases/cabinets - Chimneys/Masonry • Light Fixtures - Securing heavy objects • Library stacks - Signs/Bulletin boards • Securing heavy equipment

  32. Hazard Mitigation Letter • Learned what to do before, during, and after an earthquake • Broke into two groups for “inspecting” the school • Each student was responsible to write a persuasive letter about how the school could be made safer through earthquake mitigation techniques

  33. Tsunami Brochure • For the globalization requirement, we studied the 2004 Indian Ocean Tsunami • Students chose a particular country to focus on • Students were responsible for their own research • Amy and I provided guidance (no Wikipedia, etc.) • Students each made a three-panel informational brochure with Microsoft Publisher • Information about tsunamis • Information about their country • Information about rebuilding in their country

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