1. SAN FRANCISCO'S GOLDEN GATE BRIDGE
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2. SUSPENSION BRIDGE
•A suspension bridge is defined to be as a bridge in which the load bearing portion named as deck is hung below
by suspension cables on vertical suspenders
•Suspension bridges in their simplest form were originally made from rope and wood.
•Modern suspension bridges use a box section roadway supported by high tensile strength cables.
•In the early nineteenth century, suspension bridges used iron chains for cables.
•The cables are made of thousands of individual steel wires bound tightly together.
STEEL- BEACAUSE ITS STRONG UNDER TENSION
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3. SUSPENSION BRIDGE
•Suspension bridges tend to be the most expensive to build.
•A suspension bridge suspends the roadway from huge main cables, which extend from one end of the bridge to
the other. These cables rest on top of high towers and have to be securely anchored into the bank at either end
of the bridge.
The towers enable the main cables to be draped over long distances.
•Most of the weight or load of the bridge is transferred by the cables to the anchorage systems. These are
imbedded in either solid rock or huge concrete blocks.
•Inside the anchorages, the cables are spread over a large area to evenly distribute the load and to prevent the
cables from breaking free.
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4. SAN FRANCISCO'S GOLDEN GATE BRIDGE
•The Golden Gate Bridge in San Francisco, California is one of the
most beautiful bridge in the world.
•Linking San Francisco with Marin County the Golden Gate Bridge
is a 1.7 mile-long suspension bridge that can be crossed by car,
on bicycles or on foot
•There are parking and viewing
•Total length: Including approaches, 1.7 miles
•Middle span: 4,200 feet (1,966 m).
•Width: 90 feet (27 m)
•Clearance above the high water (average): 220 feet (67 m)
•Towers:
746 feet (227 m) above the water
500 feet (152 m) above the roadway
Each leg is 33 x 54 feet (10 x 16 m)
Towers weigh 44,000 tons each (40,200,000 kg).
There are about 600,000 rivets in EACH tower.
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5. CONSTRUCTION- DESIGN
•Steel Facts:
Total weight of steel: 83,000 tons
•Cable Facts:
Two main cables pass over the tops of the
main towers and are secured in concrete
anchorages at each end. Each cable is made
of 27,572 strands of wire. There are 80,000
miles (129,000 km) of wire in the two main
cables, and it took over six months to spin
them
•Lights:
128 lights are installed on the bridge roadway.
•AESTHETICS
•The Golden Gate Bridge design echoes an Art Deco Theme. Wide, vertical
ribbing on the horizontal tower bracing accents the sun's light on the bridge.
•The color of the bridge is officially an orange vermillion called
international orange
•The color was selected because it complements the natural surroundings and
enhances the bridge's visibility in fog CONSTRUCTION_BRIDGES_GOLDEN GATE BRIDGE
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6. WALKING ACROSS VIEW PORT OF NORTH
THE BRIDGE ENDS HOWING LANES
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