GK12 Review PresentationGK12 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

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

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

TeachEngineering.org Activity• Tension or Compression?

– Write down if the items indicated in the following pictures are in tension or compression

Tension or Compression?1. Chain of a swing

Tension or Compression?2. Leg of a swing set

Tension or Compression?3. Leg of a desk

Tension or Compression?4. Bike Chain

Tension or Compression?5. Spoke

Tension or Compression?6. Arm

http://www.healthstylesexercise.com/catalog/images/Perfect-Pushup.jpg

Tension or Compression?7. Arm

http://z.about.com/d/weighttraining/1/0/Z/0/-/-/pullup1.jpg

Tension or Compression?8. Tennis Ball

http://people.rit.edu/andpph/photofile-c/tennis-ball-rebound-2a.jpg

Tension or Compression?9. Racket Strings

http://people.rit.edu/andpph/photofile-c/tennis-ball-rebound-2a.jpg

Tension or Compression?10. Shoelace

http://www.acasports.co.uk/images/products/full/adidas_adipure_sg.jpg

Tension or Compression?11. Clothes in a full suitcase

http://farm2.static.flickr.com/1399/989922244_9c0ed3bf6e.jpg?v=0

Tension or Compression?12. Kite string

http://rick.files.wordpress.com/2008/06/kite_fight.jpg

Tension or Compression?13. Power lines

http://www.liquidmatrix.org/blog/wp-content/uploads/2007/08/powerline.JPG

Tension or Compression?14. Tripod legs

http://www.liquidmatrix.org/blog/wp-content/uploads/2007/08/powerline.JPG

Tension or Compression?15. Spring

http://www.ux1.eiu.edu/~cfadd/1350/08PotEng/Images/8.2.gif

Tension or Compression?16. Truss member DK

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

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

• Tensile Strength Graph

• Compressive Strength Graph

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

• Add Force Vectors

• Add Force Vectors

• Add Force Vectors

• Method of Joints

Hazard Mitigation Letter• Learned about structural and nonstructural

earthquake mitigation (focused on nonstructural)• Learned Mitigation Techniques for:

- Computer EquipmentComputer Equipment - Gas shut-off valves- Gas shut-off valves- Hot water heatersHot water heaters - Windows- Windows- Pictures and MirrorsPictures and Mirrors - Flexible gas lines- Flexible gas lines- Bookcases/cabinetsBookcases/cabinets - Chimneys/Masonry- Chimneys/Masonry- Light FixturesLight Fixtures - Securing heavy - Securing heavy

objectsobjects- Library stacksLibrary stacks - Signs/Bulletin - Signs/Bulletin

boardsboards- Securing heavy equipmentSecuring heavy equipment

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

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