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Golden Gate Bridge Picture from: This material is based upon work supported by the National.

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Presentation on theme: "Golden Gate Bridge Picture from: This material is based upon work supported by the National."— Presentation transcript:

1 Golden Gate Bridge Picture from: This material is based upon work supported by the National Science Foundation under Grant No Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the view of the National Science Foundation (NSF).

2 Golden Gate Bridge Joseph Baerman Strauss Born: Jan. 7, 1870 Died : May 16, 1938 Graduated from: Univ. of Cincinnati in Founded his own Company Accomplishments: Chief Engineer of the GGB Designer of the Burnside Bridge and the Lewis and Clark Bridge

3 Golden Gate Bridge The GGB took a little more than 4 and half years to build The GGB took a little more than 4 and half years to build The cost to build the bridge was $35 million The cost to build the bridge was $35 million It opened to traffic on May 28, 1937 at noon It opened to traffic on May 28, 1937 at noon

4 Golden Gate Bridge The bridge spans 4200 feet and was a world record for 27 years The bridge spans 4200 feet and was a world record for 27 years The two towers rise 746 feet ( 191 ft taller than the Washington Monument) The two towers rise 746 feet ( 191 ft taller than the Washington Monument) There are 5 lanes of traffic that link San Francisco with Marin County There are 5 lanes of traffic that link San Francisco with Marin County

5 Golden Gate Bridge The Two cables that support the floor of the bridge are 361/2 inches in diameter, the largest cables ever made. The Two cables that support the floor of the bridge are 361/2 inches in diameter, the largest cables ever made. Each cable is 7,659 feet long and contain 27,572 parallel wires (enough to encircle the world more than 3 times at the equator Each cable is 7,659 feet long and contain 27,572 parallel wires (enough to encircle the world more than 3 times at the equator

6 Golden Gate Bridge The main problem is that the bridge would have to withstand winds and gales from the Pacific Ocean The main problem is that the bridge would have to withstand winds and gales from the Pacific Ocean It was designed so that if a wind of 100 MPH hit the bridge broadside, the floor at mid span might swing as much as 27 ft. It was designed so that if a wind of 100 MPH hit the bridge broadside, the floor at mid span might swing as much as 27 ft.

7 Golden Gate Bridge A dramatic test, which the Golden Gate Bridge passed successfully, came on Saturday, December 1, Between 5:55 P.M. and 8:45 P.M. the bridge was closed to traffic because of a violent storm which generated a gale with a velocity of seventy miles an hour. The deck of the bridge swayed twenty-four feet from side to side and five feet in the perpendicular dimension. Since the bridge was designed to sustain a twenty-seven-foot sway, no serious effects came from this dramatic moment. Close examination of the structure later indicated only minor damage A dramatic test, which the Golden Gate Bridge passed successfully, came on Saturday, December 1, Between 5:55 P.M. and 8:45 P.M. the bridge was closed to traffic because of a violent storm which generated a gale with a velocity of seventy miles an hour. The deck of the bridge swayed twenty-four feet from side to side and five feet in the perpendicular dimension. Since the bridge was designed to sustain a twenty-seven-foot sway, no serious effects came from this dramatic moment. Close examination of the structure later indicated only minor damage

8 Golden Gate Bridge How have people benefited from the bridge: How have people benefited from the bridge: The people of Marin County can commute across the Golden Gate Strait into San Francisco instead of the ferry The people of Marin County can commute across the Golden Gate Strait into San Francisco instead of the ferry It has become a tourist attraction for its beauty and panoramic views It has become a tourist attraction for its beauty and panoramic views

9 Golden Gate Bridge Ethic Questions: There are studies researching the effects of earthquakes and the damage they may cause if the epicenter is close by. Some believe that a $175 Million retrofit project is needed. hhhh tttt tttt pppp :::: //// //// wwww wwww wwww.... ffff aaaa cccc tttt mmmm oooo nnnn ssss tttt eeee rrrr.... cccc oooo mmmm //// ssss pppp oooo tttt //// gggg oooo llll dddd eeee nnnn gggg aaaa tttt eeee.... hhhh tttt mmmm llll Suicides from jumpers. Building barriers to prevent verses the beauty of the bridge and added weight hhhh tttt tttt pppp :::: //// //// wwww wwww wwww.... uuuu ssss aaaa tttt oooo dddd aaaa yyyy.... cccc oooo mmmm //// nnnn eeee wwww ssss //// nnnn aaaa tttt iiii oooo nnnn //// gggg oooo llll dddd eeee nnnn gggg aaaa tttt eeee ---- ssss uuuu iiii cccc iiii dddd eeee ssss ____ xxxx.... hhhh tttt mmmm

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