Lesson 3: From Paper to Wood: Blueprinting the Truss
Duration of Days: 5
Lesson Objective
Students will apply geometric principles to create a 1:1 scale drawing of a truss bridge (Warren, Pratt, or Howe) that meets all dimensional constraints.
1. How does symmetry contribute to even load distribution?
2. How can we use triangles to ensure no single member takes the brunt of the stress?
Gusset Plate: A piece of material used to reinforce joints.
Span: The distance between the two supports.
Clearance: The required space beneath or through the bridge.
ENG.02.04: Create sketches and/or drawings.
Using graph paper and drafting tools, students design their bridge. The design must be a 1:1 scale so it can be used as a "template" for building.
Purpose: To teach the importance of planning and precision before "cutting wood."
DOK Level: Level 3 (Strategic Thinking).
Provide "Truss Templates" for students who struggle with spatial reasoning to modify rather than starting from scratch.
Peer Review. Students swap blueprints and check for "illegal" dimensions or lack of symmetry using a ruler.
Materials / Resources: 11x17 Graph paper, T-squares, protractors, Drafting pencils.