Golden Gate Bridge - Study for Expansion - San Francisco, CA is a drawing by Wall Artifact which was uploaded on January 8th, 2018.
Golden Gate Bridge - Study for Expansion - San Francisco, CA
Architect: Charles Ellis... more
Title
Golden Gate Bridge - Study for Expansion - San Francisco, CA
Artist
Wall Artifact
Medium
Drawing - Blueprint
Description
Architect: Charles Ellis
The Golden Gate Bridge is a suspension bridge spanning the Golden Gate strait, the mile-wide, three-mile-long channel between San Francisco Bay and the Pacific Ocean. The structure links the U.S. city of San Francisco, on the northern tip of the San Francisco Peninsula, to Marin County, bridging both U.S. Route 101 and California State Route 1 across the strait. The bridge is one of the most internationally recognized symbols of San Francisco, California, and the United States. It has been declared one of the Wonders of the Modern World by the American Society of Civil Engineers.The orange color was never intended to be the final color and was originally used as a sealant.
The well-known engineering company of John Roebling and Sons oversaw the cable construction. Roebling had built many of the world's longest bridges -- including the Brooklyn Bridge, 52 years earlier. The firm had devised the most efficient strength-to-rigidity ratio for cables. It had also developed a technique of spinning cables on-site. The Roebling crew's work on the Golden Gate Bridge continued a tradition of innovation. Cable spinning began in October 1935. To create the cables, Roebling developed a method called parallel wire construction. The innovative technique enabled a cable of any length and thickness to be formed by binding together thin wires. It promised to give engineers the freedom to build a bridge of infinite length. Hundreds of wires, each roughly the diameter of a pencil, were bound together into strands. The Golden Gate uses the largest bridge cables ever made -- long enough to encircle the world more than three times at the equator. One wire at a time, the cables for the Golden Gate bridge were spun from tower to tower, anchorage to anchorage. The spinning was tedious; not only did it take time for the spinning wheel to travel the mile between the two shores, but the work had to be performed in a precise sequence, in order to create the balance needed for the cables to absorb the proper amount of wind pressure as specified in Charles Ellis' design. Eventually, Roebling devised a system to spin six wires simultaneously color coded to prevent confusion. Six wires at a time had the spinning wheels guiding as much as 1,000 miles of wire across the span in an eight-hour shift. When the weather was good, the wheels took just six and a half minutes to travel halfway across the span.
Uploaded
January 8th, 2018
