1. Bridges

2. Some Uses of Bridges Walkways Highways/Roads Railways Pipelines
Connecting lands
Crossing rivers and canyons

3. Types of Bridges
Arch
Truss
Cable-Stayed
Suspension

4. What makes a bridge stay up?
Forces
Compression – a pushing or squeezing force
Tension – a pulling or stretching force
Demonstration

5. Arch Bridges
Keystone – the wedge-shaped stone of an arch that locks its parts together
Abutments – the structures that support the ends of the bridge

6. Arch Bridges
Works by
Compression

7. Arch Bridges
Where have you seen these bridges?

8. Cold Spring Arch Bridge, Santa Barbara, CA

9. Marsh Rainbow Arch, Riverton, KS

10. Pont du Gard, Nimes, France

11. Cable-Stayed Bridges Piers – the vertical supporting structures
Cables – thick steel ropes from which the decking is suspended
Decking – the supported roadway on a bridge

12. Cable-Stayed Bridges
Works by Tension AND Compression

13. Cable-Stayed Bridges
Where have you seen these bridges?

14. Zakim Bridge, Boston, MA

15. Sunshine Skyway Bridge, Tampa, FL

16. Sundial Bridge, Redding, CA

17. Suspension Bridges Similar to Cable-Stayed
Different construction method

18. Suspension Bridges
Works by Tension and Compression

19. Suspension Bridges
Where have you seen these bridges?

20. Golden Gate Bridge, San Francisco, CA

21. Brooklyn Bridge, Brooklyn, NY

22. Verrazano-Narrows Bridge, New York, NY

23. Other Types Truss Southern Pacific Railroad Bridge, Tempe, AZ
Cantilever
Firth of Forth-Forth Rail Bridge, Edinburgh, Scotland