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Suspension Bridges Getting ready to design your own!

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Presentation on theme: "Suspension Bridges Getting ready to design your own!"— Presentation transcript:

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

6 Roeblings First Bridge: Niagara Falls in 1855 to 1897 Niagara Falls in 1855 to feet 825 feet Suspension railway Suspension railway

7 Roeblings Brooklyn Bridge: Longest of its time 1595 feet in feet in 1883

8 Other Famous Suspension Bridges

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

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11 Top 10 bridges in the world by length: 1.Akashi-Kaikyo Bridge (Japan), 1991 m Xihoumen Bridge (China), 1650 m Great Belt Bridge (Denmark), 1624 m Runyang Bridge (China), 1490 m Humber Bridge (England, United Kingdom), 1410 m (The longest span from 1981 until 1998.) 6.Jiangyin Suspension Bridge (China), 1385 m Tsing Ma Bridge (Hong Kong, China), 1377 m 1997 (longest span with both road and metro) 8.Verrazano-Narrows Bridge (USA), 1298 m (The longest span from 1964 until 1981.) 9.Golden Gate Bridge (USA), 1280 m (The longest span from 1937 until 1964.) 10.Yangluo Bridge (China), 1280 m 2007

12 Brooklyn Bridge ( NY,USA, 1883), The first steel-wire suspension bridge.Brooklyn 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.Bear Mountain Bridge 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.John A. Roebling Suspension Bridge Mackinac Bridge (USA, 1957), The longest suspension bridge between anchorages in the Western hemisphere.Mackinac Bridge Roebling's Delaware Aqueduct (NY,USA, 1847) The oldest wire suspension bridge still in service in United States.Roebling's Delaware Aqueduct Royal Gorge Bridge (Colorado, USA, 1929), The highest (384 m) suspension bridge in the world.Royal Gorge Bridge 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.San Francisco – Oakland Bay Bridge

13 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)

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18 Even closer to home… Ambassador Bridge Detroit

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

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 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:


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