The world’s Longest Suspension Bridge!
The Akashi-Kaikyo, Suspension Bridge in Japan isn the world’s Longest suspension bridge.It was completed in 1998.It links the island of Awaji and the mainland city of Kobe by crossing the busy Akashi Strait.Overall, the bridge is 3,911 meters long.Its two towers,at 298 metres, soar higher than any other bridge towers in the world.
It took two million workers ten years,1,81,000 tonnes of steel and 1.4 million cubic metres of concrete to construct the bridge.It has six lanes and it cost an estimated 500billion Japanese yen(U.S. $3.6 billion) to built the bridge.
In addition, engineers placed 20 tuned mass dampers (TMDs) in each tower to counteract the wind sway. So when the wind blows the bridge in one direction,the TMDs saway in the opposite direction,effectively “balancing” the bridge and cancelling out the sway. As a result , the Akashi Kaikyo can handle winds blowing at 286 KM/Hour and it can withstand an earthquake measuring 8.5 on the richter scale. The Akashi- kaikyo Suspension Bridge is indeed a marvel of modern engineering.
* The length of the cables used in the bridge totals 300,000 Kilometres. That’s enough to circle the earth 7.5 times!!
* The bridge was originally designed to be 12,825 feet. But on 17th January 1995, the Great Hanshin Earthquake stretched the bridge an additional three feet.