The Longest Suspension Bridge in the World Akashi KaikyO

Presentation created by Christopher Geaslin

On April 5th, 1998 the longest suspension bridge in the world was officially opened. The Akashi Kaikyo Bridge has a main span of 1,991 meters, and took ten years to build. Spanning the four kilometers of the Akashi straits, this suspension bridge connects the Japanese islands of Honshu and Shikoku.

Throughout the whole ten years of construction, only a couple of accidents occurred, resulting in six injuries and no deaths. This is a world class record for a bridge this size. This project involved more than one hundred contracters.

The Akashi Kaikyo Bridge was built to withstand 80 meter per second winds and a 8.5 Richter earthquake about 150 kilometers away. It was constructed in 110 meter deep water, with tidal currents of about 4.5 meters per second. The bridge is constructed of about 181,400 tons of steel and 1.42 million cubes of concrete. During construction of the bridge, an earthquake occurred, and permanently increased the length of the main span by 0.8 meters, and the southern span by 0.3 meters. The towers also changed height, one rose 0.2 meters, and the other fell 0.2 meters. The whole project cost about 500 billion Japanese yen, or about 3.6 billion U.S. dollars.

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