Akashi Kaikyo Bridge

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The Script error: No such module "Nihongo". is a suspension bridge that links the city of Kobe on the Japanese island of Honshu and Template:Ill on Awaji Island. It is part of the Kobe-Awaji-Naruto Expressway, and crosses the busy and turbulent Akashi Strait (Akashi Kaikyō in Japanese). It was completed in 1998,[1] and at the time, was the longest central span of any suspension bridge in the world,[2] at Script error: No such module "convert".. Currently, it is the second-longest, behind the 1915 Çanakkale Bridge in Turkey that was opened in March 2022.

The Akashi Kaikyo Bridge is one of the key links of the Honshū–Shikoku Bridge Project, which created three routes across the Seto Inland Sea.

History

Background

The Akashi Kaikyo Bridge forms part of the Kobe-Awaji-Naruto Expressway, the easternmost route of the bridge system linking the islands of Honshu and Shikoku.[3] The bridge crosses the Akashi Strait (width 4 km) between Kobe on Honshu and Iwaya on Awaji Island; the other major part of the crossing is completed by the Ōnaruto Bridge, which links Awaji Island to Ōge Island across the Naruto Strait.[3]

Before the Akashi Kaikyo Bridge was built, ferries carried passengers across the Akashi Strait. A major passageway for shipping, it is also known for its gales, heavy rain, storms, and other natural disasters.[4] The Template:Ill in stormy weather in December 1945, while carrying more than three times its capacity of 100 passengers, killed 304 people, first stirring public discussion on the possibility of a bridge over the span. In 1955, two ferries sank in the Shiun Maru disaster during a storm, killing 168 people. The ensuing shock and public outrage convinced the Japanese government to develop plans for a bridge to cross the strait.[5]

Investigations

Investigations for a bridge across the strait were first conducted by the Kobe municipal government in 1957, followed by an evaluation by the national Ministry of Construction in 1959. In 1961, the Ministry of Construction and Japan National Railways jointly commissioned the Japan Society of Civil Engineers (JSCE) to conduct a technical study, and the JSCE established a committee to investigate five potential routes between Honshu and Shikoku. In 1967, the committee compiled the results of the technical study, concluding that a bridge across the Akashi Strait would face "extremely severe design and construction conditions, which have no similar examples in the world's long-span bridges" and recommending an additional study.[6]

In response to the report, the Honshu–Shikoku Bridge Authority (now the Honshu-Shikoku Bridge Expressway Company[3]) was established in 1970, which conducted extensive investigations, including sea trials to establish the construction method of a submarine foundation. In 1973, a bridge with a central span of 1,780 meters on the route was approved, but construction was halted due to poor economic conditions.[6]

Construction

File:Akashi-Kaikyo Bridge h008.jpg
Akashi Kaikyo Bridge, under construction in December 1995

The original plan called for a mixed railway-road bridge, but when construction on the bridge began in April 1988, it was restricted to road only, with six lanes. Actual construction did not begin until May 1988 and involved more than 100 contractors.[7] The Great Hanshin Earthquake in January 1995 did not do substantial damage to the bridge due to anti-seismic building methods.[3] Construction was finished on time in September 1996.[8][9] The bridge was opened for traffic on April 5, 1998, in a ceremony officiated by the then-Crown Prince Naruhito and his spouse Crown Princess Masako of Japan along with Construction Minister Tsutomu Kawara.[7] The bridge was the last Japanese megaprojects of the 20th century.[10]

Structure

Substructures

File:Akashi Kaikyo Bridge Maiko Hyogo Japan (19175872663).jpg
The illuminated Akashi Kaikyo Bridge, 2006.

The bridge has four substructures: two main piers (located beneath the water) and two anchorages (on land). These are denoted 1A, 2P, 3P, and 4A in sequence from the Kobe side. 1A consists of an underground circular retaining wall filled with roller-compacted concrete, 2P and 3P are circular underwater spread-foundation caisson structures, and 4A is a rectangular direct foundation.[3] 2P is located at the edge of the sea plateau at a level depth of 40–50 m and a bearing depth of 60 m, and 3P is located at the symmetrical point to 2P with respect to the bridge's center, at a level depth of 36–39 m and a bearing depth of 57 m.[3]

File:Akashikaikyobridge-sunnyday-fromriver2013.ogv
Video of the bridge, as seen from a ship passing underneath

The towers are located in an area of strong tidal currents where water velocity exceeds 7 knots (about 3.6 m/s). The selected scour protection measure includes the installation of a filtering layer with a thickness of 2 m in a range of 10 m around the caisson, covered with riprap of 8 m thick.[11]

Superstructures

File:Akashi-Bridge-2.jpg
Main supporting towers

The bridge has three spans. The central span is Script error: No such module "convert".,[1] and the two other sections are each Script error: No such module "convert".. The bridge is Script error: No such module "convert". long overall. The two towers were originally Script error: No such module "convert". apart, but the Great Hanshin earthquake on January 17, 1995 (magnitude 7.3, with epicenter 20 km west of Kobe) moved the towers (the only structures that had been erected at the time) such that the central span had to be increased by Script error: No such module "convert"..[1] The central span was required to be greater than 1,500 m to accommodate maritime traffic; it was concluded before construction began that a larger span between 1950 and 2050 meters would minimize construction costs.[3]

The bridge was designed with a dual-hinged stiffening girder system, allowing the structure to withstand winds of Script error: No such module "convert"., earthquakes measuring up to magnitude 8.5, and harsh sea currents. The bridge also contains tuned mass dampers that are designed to operate at the resonance frequency of the bridge to damp forces. The two main supporting towers rise Script error: No such module "convert". above sea level, and the bridge can expand because of heat by up to Script error: No such module "convert". over the course of a day.[4] Each anchorage required Script error: No such module "convert". of concrete. The steel cables have Script error: No such module "convert". of wire: each cable is Script error: No such module "convert". in diameter and contains 36,830 strands of wire.[1][8]

The Akashi–Kaikyo bridge has a total of 1,737 illumination lights: 1,084 for the main cables, 116 for the main towers, 405 for the girders and 132 for the anchorages. Sets of three high-intensity discharge lamps in the colors red, green and blue are mounted on the main cables. The RGB color model and computer technology make for a variety of combinations. Twenty-eight patterns are used for occasions such as national or regional holidays, memorial days or festivities.[12]

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Facilities

On the Kobe side of the bridge girder is the Maiko Marine Promenade, a pedestrian walkway and observation facility. Visitors ascend by elevator inside the bridge anchorage to a height of approximately 47 meters above sea level and can proceed about 150 meters toward the sea. Parts of the walkway feature transparent flooring, allowing direct views of the water below. Also located on the Kobe side is the Bridge Exhibition Center, which presents technical and historical exhibits focused on the Akashi Kaikyō Bridge and bridge engineering in general. Displayed overhead is a 1:100 scale model used in wind tunnel testing. As souvenirs, actual samples of individual cable wires are sold. A reservation-only program known as Bridge World [13]is offered on a limited basis, allowing participants to access normally restricted maintenance passages and ascend to the top of the main tower.

Gallery

Cost

The total cost is estimated at ¥500 billion or US$3.6 billion (per 1998 exchange rates).[7] It is expected to be repaid by charging drivers a toll to cross the bridge. The toll is 2,300 yen and the bridge is used by approximately 23,000 cars per day.[14]

See also

References

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  1. ↑ a b c d Akashi Kaikyo Bridge Template:Webarchive at Structurae
  2. ↑ Akashi-Kaikyo Bridge Template:Webarchive – HSBE
  3. ↑ a b c d e f g Script error: No such module "citation/CS1".
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  7. ↑ a b c Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
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  11. ↑ Script error: No such module "Citation/CS1".
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  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".

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External links

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