Bridge

1. Bridges:
History, Forces, & Types

2. History
•The first bridges consisted
of fallen logs over rivers.

3. History
• The development of rope allowed
people to build primitive
suspension bridges.
• You can see examples of this type
of bridge in many movies.

4. I guarantee you have all been on one

5. • Isn’t this the same thing?

6. Who Designs them?
• A Civil Engineer is a
person who designs
bridges
• Civil Engineers must
be strong in math
and science to be
able to properly
design a bridge

7. Forces
• Tension: A force that tries to
stretch material and pull it apart
• Compression: A force that tries to
push or squeeze material together

8. More Forces
• Shear: A force that tries to make
materials tear and slide by each
other
• Torsion: A Force that tries to
twist and bend materials

9. What happens when there is too
much force on a bridge?

10. Beam Bridge
Compression
Tension

11. Truss Bridge
Compression
Tension

12. Arch Bridge
Compression
Tension

13. Suspension Bridge
Compression
Tension

14. Cable-Stay Bridge
Compression
Tension

15. Review