| Name | Golden Gate Bridge San Francisco, California, USA |
|---|---|
| Who | |
| Owner | Golden Gate Bridge & Highways District for State of California The bridge was created through a special act of the state legislature in 1923 |
| Design | Joseph B Strauss - Chief Engineer |
| Consultants | Leon S Moisseiff, O H Amman, Charles Derleth Jr |
| Contractors | Main Piers: Pacific Bridge Company Anchorages & Approach Piers: Barrett & Hilp. Cables: John A Roebling Company Steel: Bethlehem Steel Company |
| Where | San Francisco |
| Latitude | N 37 49' 11" |
| Longitude | W 122 28' 43" |
| When | 1937 |
| Why | US Highway 101 connects the City & County of San Francisco with Marin County |
| Spans the Golden Gate | the opening of the San Francisco Bay to the Pacific Ocean |
| What | Read some more details..... | How to read a bridge | Read more about suspension bridges..... Read more about the book metaphor..... |
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| What | |
|---|---|
| Overall type | Hanging - Suspension Bridge. Read more about suspension bridges..... |
| Width | 27 m. - 6 lanes traffic |
| Length | 2,737 m. |
| Spans | Main span: 1,280 m. Each side span: 343 m. |
| Clearance above high water level | 67 m. |
| Height of tower | 227 m. |
| Materials | Steel |
| Cables | 2 main cables: 0.92 m. diameter. No of wires in cable: 27,572 Diameter of wire: 5 mm. Number of strands in each cable: 61 Suspenders: 250 pairs of ropes each mm. diameter (all were replaced in 1972-76) |
| Retrofit programme 2001 - 2012 for seismic shock | Study initiated immediately after 1989 earthquake. Need to retrofit for earthquakes of Richter magnitude 7 or above. Phase 1 1997-2002 - strengthening together with installing of isolator bearings, expansion joints. 4 support towers replaced during continuous traffic flow. Phase 2 2001-2008 - replacing support towers, anchorage housing plus new shear walls, installing isolation bearings and joints, adding new steel plating, new bearings and energy dissipation devices and isolation joints. Phase 3 2008-2012 - strengthening foundations, installing piles and rock bolts, shear walls and other structural modifications. |
| Appearance | Famous for its red appearance officially called "international orange". Art Deco form by architects Irving F Morrow. |
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