1. Getting ready to design your own!
Suspension Bridges
Getting ready to design your own!

2. What is a suspension bridge:
One of the several types of bridge designs
Used for the longest spans
Cables- suspend the roadway
Towers- stabilize wire cables
(offer little support)
Anchorages- key to the structure, mass that keeps cables tight, gives the bridge structure

3. Suspension Bridge

4. With anchorages
Without anchorages

5. Roebling’s Engineering Contributions:
Engineer famous for American suspension bridges
Use of steel
Development of wire cables
Spinning: assembling heavy cables in the air
Advancement of stiffening trusses
Truss: triangular structure that adds strength not weight

6. Roebling’s First Bridge:
Niagara Falls in 1855 to 1897
825 feet
Suspension railway

7. Roebling’s Brooklyn Bridge:
Longest of it’s time
1595 feet in 1883

8. Other Famous Suspension Bridges

9. Akashi Kaikyo Bridge Hyogo, Japan 6,529 ft
Longest suspension bridge today

11. Top 10 bridges in the world by length:
Akashi-Kaikyo Bridge (Japan), 1991 m — 1998
Xihoumen Bridge (China), 1650 m — 2007
Great Belt Bridge (Denmark), 1624 m — 1998
Runyang Bridge (China), 1490 m — 2005
Humber Bridge (England, United Kingdom), 1410 m — (The longest span from 1981 until 1998.)
Jiangyin Suspension Bridge (China), 1385 m — 1997
Tsing Ma Bridge (Hong Kong, China), 1377 m — 1997 (longest span with both road and metro)
Verrazano-Narrows Bridge (USA), 1298 m — (The longest span from 1964 until 1981.)
Golden Gate Bridge (USA), 1280 m — (The longest span from 1937 until 1964.)
Yangluo Bridge (China), 1280 m — 2007

12. Brooklyn Bridge ( NY,USA, 1883), The first steel-wire suspension bridge.
Bear Mountain Bridge (NY, USA, 1924), The longest span (497 m)from 1924 to The first suspension bridge to have a concrete deck. The construction methods pioneered in building it would make possible several much larger projects to follow.
John A. Roebling Suspension Bridge (Ohio, USA: 1866), Then the longest wire suspension bridge in the world at 1,057 feet (322 m) main span.
Mackinac Bridge (USA, 1957), The longest suspension bridge between anchorages in the Western hemisphere.
Roebling's Delaware Aqueduct (NY,USA, 1847) The oldest wire suspension bridge still in service in United States.
Royal Gorge Bridge (Colorado, USA, 1929), The highest (384 m) suspension bridge in the world.
San Francisco – Oakland Bay Bridge (USA, 1936), Until recently, this was the longest steel high-level bridge in the world. The oldest in the world still in use today.

13. Mackinac Island Bridge
Bridges close to home!
Mackinac Island Bridge

14. The longest between anchorages in the Western hemishere

15. Total length: 26,372 feet (8,038 m)
Width: 68.6 feet (20.9 m)
Height: 522 feet (159 m)
Longest span: 3,800 feet (1,158 m)

18. Even closer to home…
Ambassador Bridge
Detroit

21. Ambassador Bridge Dimensions:
Total length7,500 feet (2,286 m)
Longest span1,850 feet (564 m)

22. A B C Total length ______________________ (A)
Span length (tower to tower) _____________________(B)
Total height of each tower _________________________(C)
Total width of the roadway __________________________

23. Total scale length: Scale span length: Total scale height:
The General Contractor wants to see a scale model of this bridge before you begin construction. You will have limited workspace. You will need to scale the feet down to a workable unit. In this case you will use 1 inch to equal 50ft.
Total scale length:
Scale span length:
Total scale height:
Total scale roadway width: