旧金山金门大桥Golden_Gate_Bridge.ppt

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A suspension bridge spanning the Golden Gate, the opening of the San Francisco Bay into the Pacific Ocean. The Golden Gate Bridge was the longest suspension bridge span in the world when it was completed in 1937, and has become one of the most internationally recognized symbols of San Francisco, California, and of the United States. Design : Strauss was chief engineer in charge of overall design and construction of the bridge project. However, because he had little understanding or experience with cable-suspension designs, responsibility for much of the engineering and architecture fell on other experts. Irving Morrow, a relatively unknown residential architect, designed the overall shape of the bridge towers, the lighting scheme, and Art Deco elements such as the streetlights, railing栏杆, and walkways. Death! * * Golden Gate Bridge Structure: The weight of the roadway is hung from two cables that pass through the two main towers and are fixed in concrete 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 main cables. The bridge has approximately 1,200,000 total rivets(铆钉). Structure Official Pedestrian Day: May 27, 1937 Bridge opens for traffic: May 28, 1937 Aesthetics Despite its red appearance, the color of the bridge is officially an orange vermillion called international orange. The color was selected by consulting architect Irving Morrow because it complements the natural surroundings and enhances the bridges visibility in fog. Suicides The Golden Gate Bridge is the most popular place to commit suicide in the entire world.

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