1870 Joseph B. Strauss 1938 "The Man Who Built The Bridge" Here At The Golden Gate Is The Eternal Rainbow That He Conceived And Set Form, A Promise Indeed That the Race of Man Shall Endure Unto The Ages Chief Engineer Of The Golden Gate Bridge 1929 -1937
This is exactly the way it has been etched in stone to honour the legendary engineer who built the Golden Gate Bridge which stands rock solid today (and will continue to hold its majesty over the centuries ahead) amidst the icy chill waters and the bone chilling winds of the Pacific Ocean without any damage or deterioration.
An iconic bridge well known throughout the world the Golden Gate bridge is perhaps the most visited and photographed bridge in the world today. The Golden Gate Bridge is a suspension bridge spanning the Golden Gate strait, the (approximately) 1.60 kms wide and 4.80 kms long channel between San Francisco Bay and the Pacific Ocean. The bridge links the city of San Francisco, California – the northern tip of the San Francisco Peninsula – to Marin County. The bridge is one of the most internationally recognized symbols of San Francisco, California, and the United States. It has been declared as one of the Wonders of the Modern World by the American Society of Civil Engineers.
In 1921, engineer Joseph B. Strauss submitted a design for a bridge that would cross the Golden Gate Strait — a hybrid bridge with a suspension span supported at each end by cantilever trusses. By 1929, consulting engineers Leon S. Moisseiff and O.H. Ammann had persuaded Strauss to accept the more graceful all-suspension bridge design that we see today.
Strauss assigned engineer Charles A. Ellis to work in collaboration with Moisseiff to perform the calculations needed to complete the design, which was complex and challenging work done without modern computers. The most common "calculator" that structural engineers used in that era was a slide rule, and drafting was done with pencil and paper on drawing boards. There was no CAD design or computers or automation in those days to facilitate design and calculations. The construction of the bridge commenced on January 5, 1933 and was completed on April 19, 1937. The bridge was inaugurated on May 27, 1937 - about 79 years ago. The rest is history.
Here are a few interesting facts of this bridge :
Total length of the bridge: 2.9 kms (1,7 miles)
Width of the bridge: 27.5 meters(90 feet)
Total weight when built: About 894,500 tons. Cables: 2 main cables pass over the 2 towers. There are about 133,333 kms or 80,000 miles of wires in these 2 cables. Cable dia and length: Each cable is about .095 meters dia (36.75 inch dia) and 2,330 meters or 7,650 feet long.
Height of the bridge: About 227 meters or 746 feet from the high tide level to the top of the tower and about 152 meters of 500 feet from the top of the carriageway to the of the tower. Clearance below the bridge 75 meters or 246 feet.
Weight of towers: Each tower weights about 44,500 tons with about 600,000 rivets in each tower.
Total amount of steel used : About 83,000 tons.
Total concrete poured: About 295,640 cubic meters.
Force factors: Can withstand wind speed of 150 kph or 90 mph and seismic shock of 8.00 on Richter scale and of course the well known fog over San Francisco.
Paint: International Orange for the best visibility.
It was a lifetime unforgettable experience to travel over the bridge and photograph. I hope you enjoy the pictures.