1. Bridges
By Mr. Huebsch

2. Design Process Find the problem Brainstorm ideas Clarify ideas
Test your ideas
Create Models
Accept, Reject and Alter ideas

3. Vocabulary Construction – the action of building
Structure – any form or shape
Bridges – anything that covers a space or spans a distance

4. Types of Bridges Early Bridges Fallen Logs Rope
Ok for people to cross but not good for heavy loads.
Short spans

5. Types of Bridges Truss Bridges Can be made of Steel or stone
Not capable of long spans
Can handle heavy loads
Railroad bridges

6. Types of Bridges Arch Bridges Can be made of Steel or stone
Capable of longer spans
Can handle heavy loads
One built in during the Roman Empire still stands years old

7. Types of Bridges Suspension Bridges Examples Made of Steel and cable
Capable of the longest spans of any type of bridge
Can handle heavy loads
Examples

8. Types of Bridges Cantilever Bridges Type of truss Bridge
Two halves starting at the banks and joined with a section in the middle
Examples

9. Types of Trusses!
King Post

10. Types of Trusses
Warren Truss

11. Types of Trusses
Pratt Truss

12. Types of Trusses
K-Truss

13. Types of Trusses
Whipple Bowstring

14. Types of Trusses
Bollman

15. Cuts
Cross Overs – Each time a line crosses another line you will need to make a cut – On one line for this bridge a minimum of 12 cuts will need to be made!

16. Types of Trusses
Town Lattice

17. Types of Trusses
Howe Truss

18. Travel Surfaces
Pony Truss
Traffic travels through

19. Travel Surfaces
Through Truss
Traffic travels through

20. Travel Surfaces
Deck Truss
Traffic travels on top

21. Considerations Hold 20 pounds Be 12 inches long Be 2 inches wide
Not use more than 192 inches of wood
At least 2 inches tall