19 March 2008

Which is the longest Suspension Bridge??

The Akashi-Kaikyō Bridge , also known as Pearl Bridge in Japan was completed in 1998 and is the world's longest suspension bridge (measure by the length of the centre span of 1,991 metres or 6,532 ft). It links the city of Kobe on the mainland of Honshū to Iwaya on Awaji Island by crossing the busy Akashi Strait. It carries the part of the Honshū-Shikoku Highway.

The bridge is one of the key links of the Honshū-Shikoku Bridge Project, which created three routes across the Inland Sea.


The bridge has three spans. The central span is 1,991 meters (6,532 ft), with the two other sections each 960 meters (3,150 ft). The bridge is 3,911 meters (12,831 ft) long overall. The central span was originally only 1,990 meters (6,529 ft), but the Kobe earthquake on January 17, 1995 moved the two towers sufficiently so that it had to be increased by 1 meter (only the towers had been erected at the time).

The bridge was designed with a two-hinged stiffening girder system, allowing the structure to withstand winds of 286 kilometers per hour (178 mph), earthquakes measuring to 8.5 on the Richter scale, and harsh sea currents. The bridge also contains pendulums which are designed to operate at the resonance frequency of the bridge to damp forces. The two main supporting towers are 298 meters (978 ft) above sea level, and the bridge can expand up to two meters in one day.


The total cost is estimated at ¥ 500 billion (~US$5 billion), and is expected to be defrayed by charging commuters a toll to cross the bridge. The toll is ¥2,300 yen (US$20.00) and is used by approximately 23,000 cars/day.

Further Info:

Get the list of over 100 suspension bridges ranked from their length starting from 1 -->click

Akashi -->wiki link

Suspension bridges

Workin of suspension bridge


My choice "Golden Gate-SanFrancisco"


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