Suspension Bridges
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Transcript of Suspension Bridges
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Suspension BridgesSuspension Bridges
Getting ready to design your Getting ready to design your own!own!
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What is a suspension bridge:What is a suspension bridge:
One of the several types of bridge designsOne of the several types of bridge designs
Used for the longest spansUsed for the longest spans
Cables-Cables- suspend the roadway suspend the roadway
Towers-Towers- stabilize wire cables stabilize wire cables (offer little support)(offer little support)
Anchorages-Anchorages- key to the structure, mass that keeps key to the structure, mass that keeps cables tight, gives the bridge structure cables tight, gives the bridge structure
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Suspension Bridge
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With anchorages
Without anchorages
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Roebling’s Engineering Roebling’s Engineering Contributions:Contributions:
Engineer famous for American suspension bridgesEngineer famous for American suspension bridges
Use of steelUse of steel
Development of wire cablesDevelopment of wire cables SpinningSpinning: assembling heavy cables in the air: assembling heavy cables in the air
Advancement of stiffening trussesAdvancement of stiffening trusses TrussTruss: triangular structure that adds strength not weight: triangular structure that adds strength not weight
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Roebling’s First Bridge:Roebling’s First Bridge: Niagara Falls in 1855 to Niagara Falls in 1855 to 18971897
825 feet 825 feet Suspension railwaySuspension railway
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Roebling’s Brooklyn Bridge:Roebling’s Brooklyn Bridge:
Longest of it’s time Longest of it’s time 1595 feet in 18831595 feet in 1883
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Other Famous Other Famous Suspension Suspension
BridgesBridges
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Akashi Kaikyo BridgeAkashi Kaikyo Bridge
• Hyogo, Japan Hyogo, Japan
• 6,529 ft 6,529 ft
• Longest suspension Longest suspension bridge todaybridge today
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Top 10 bridges in the world by length:
1. Akashi-Kaikyo Bridge (Japan), 1991 m — 1998
2. Xihoumen Bridge (China), 1650 m — 2007 3. Great Belt Bridge (Denmark), 1624 m — 1998 4. Runyang Bridge (China), 1490 m — 2005 5. Humber Bridge (England, United Kingdom), 1410 m — 1981.
(The longest span from 1981 until 1998.)
6. Jiangyin Suspension Bridge (China), 1385 m — 1997 7. Tsing Ma Bridge (Hong Kong, China), 1377 m — 1997 (longest
span with both road and metro)
8. Verrazano-Narrows Bridge (USA), 1298 m — 1964. (The longest span from 1964 until 1981.)
9. Golden Gate Bridge (USA), 1280 m — 1937. (The longest span from 1937 until 1964.)
10.Yangluo Bridge (China), 1280 m — 2007
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• 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 1926. 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.
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Bridges close to home!Bridges close to home!
Mackinac Island Mackinac Island BridgeBridge
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•The longest between anchorages in the Western hemishere
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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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Even closer to home…
Ambassador Bridge
Detroit
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•Total length7,500 feet (2,286 m)•Longest span1,850 feet (564 m)
Ambassador Bridge Dimensions:
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A
BC
Total length ______________________ (A)
Span length (tower to tower) _____________________(B)
Total height of each tower _________________________(C)
Total width of the roadway __________________________
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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: