1 / 18

BRIDGE BUILDING ASSIGNMENT

BRIDGE BUILDING ASSIGNMENT. Work with a partner to construct 1 bridge . Last Module Partner. Draw a full size truss pattern from one of the six truss examples. Construct the bridge using balsa wood. Test the efficiency & applied force of the bridge. BRIDGE SPECIFICATIONS.

louvain
Download Presentation

BRIDGE BUILDING ASSIGNMENT

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. BRIDGE BUILDING ASSIGNMENT • Work with a partner to construct 1 bridge. • Last Module Partner. • Draw a full size truss pattern from one of the six truss examples. • Construct the bridge using balsa wood. • Test the efficiency & applied force of the bridge.

  2. BRIDGE SPECIFICATIONS • Work as a team to design and construct a balsa wood bridge. • You may use no more than 7 - 24”x1/8” balsa sticks. (14 ft. total) • The bridge must have two identical trusses & a roadbed • The bridge must be exactly 10” in length. • The test block must fit between the two trusses. • No excessive glue blobs. • Support weight = Over 50 lbs. • Tape may only be used to hold pieces while glue dries. • Only two pieces of balsa wood may be laminated together.

  3. EXAMPLES OF TRUSS BRIDGES

  4. UNDERNEATH DECK TRUSS

  5. THROUGH TRUSS

  6. TRIANGULAR TRUSS

  7. K TRUSS

  8. WARREN TRUSS WITH VERTICAL SUPPORTS

  9. BALTIMORE TRUSS

  10. BRIDGES GRADESHEET TRUSS VIEW DRAWING GRADE Lines are drawn with ruler. No wavy lines ____ pts. (20) Lines are 1/8” thick. ____ pts. (20) Drawing should have neat appearance. ____ pts. (20) Joints are clearly drawn. ____ pts. (20) Complete wood usage calculations. ____ pts. (20) • ____ pts. (100) BALSA BRIDGE CONSTRUCTION Two trusses must be stand vertically. ____ pts. (20) No excessive glue blobs. ____ pts. (20) Tight joints. ____ pts. (20) Roadbed & top pieces do not over hang trusses. ____ pts. (20) Over 50 lbs. = 20 pts.40 – 49 lbs. = 15 pts. Below 40 lbs. = 10 pts. ____ pts. (20) ____ pts. (100)

  11. The truss bridge...consists of an assembly of triangles. Truss bridges are commonly made from a series of straight, steel bars. TRUSS BRIDGE

  12. ROADBED LEFT ABUTMENT RIGHT ABUTMENT BRIDGE TERMS SUPERSTRUCTURE ABOVE ROADBED SUBSTRUCTURE BELOW ROADBED SPAN WATER

  13. 1 1 1 1 2 2 9 9 2 2 9 9 8 8 8 8 0 0 0 0 3 3 4 4 3 3 4 4 5 5 6 6 7 7 5 5 6 6 7 7 10 10 10 10 3 3 2 2 1 1 Baltimore Truss Warren Truss with Vertical Supports K Truss 1 1 2 9 2 9 8 8 0 0 3 4 3 4 5 6 7 5 6 7 10 10 3 2 1 0 1 Through Truss Triangular Truss 0 0 1 1 Underneath Deck Truss TRUSS EXAMPLES

  14. EXAMPLES OF JOINTS USED IN BALSA BRIDGE BUILDING

  15. 3 2 1 0 1 WATER GRADING PROCEDURE Lines are drawn with ruler (no wavy lines) Lines are 1/8” thick. Appearance of drawing (Easy to read) Complete wood usage calculations. Joints are clearly drawn. GRID SIZE = .25 0 1 7 2 3 9 8 4 6 5 10 DO NOT SHADE IN THE LINES! TRUSS VIEW Drawn by: __________________________________ Block #_____ Date: ____________

  16. 3 2 1 0 1 WATER GRADING PROCEDURE Lines are drawn with ruler (no wavy lines) Lines are 1/8” thick. Appearance of drawing (Easy to read) Complete wood usage calculations. Joints are clearly drawn. GRID SIZE = .25 0 1 7 2 3 9 8 4 6 5 10 DO NOT SHADE IN THE LINES! Good joint Bad joint TRUSS VIEW Drawn by: __________________________________ Block #_____ Date: ____________

  17. 3 2 1 0 1 WATER 10 GRADING PROCEDURE Lines are drawn with ruler (no wavy lines) Lines are 1/8” thick. Appearance of drawing (Easy to read) Complete wood usage calculations. Joints are clearly drawn. 18.25 15.50 43.75 3.6 7.2 GRID SIZE = .25 0 1 7 2 3 9 8 4 6 5 10 8.25” 2.25” 2.25” 2.75” 2.75” 2.75” 2.75” 2” 2” 2” 2” 2” 10” TRUSS VIEW Drawn by: __________________________________ Block #_____ Date: ____________

More Related