{"id":91436,"date":"2021-07-13T06:00:24","date_gmt":"2021-07-13T04:00:24","guid":{"rendered":"https:\/\/www.stradeeautostrade.it\/?p=91436"},"modified":"2021-07-23T12:51:52","modified_gmt":"2021-07-23T10:51:52","slug":"a-symbol-for-turkey-a-feat-for-engineering","status":"publish","type":"post","link":"https:\/\/www.stradeeautostrade.it\/en\/infrastructures-road-network\/a-symbol-for-turkey-a-feat-for-engineering\/","title":{"rendered":"Canakkale bridge: a symbol for Turkey, a feat for engineering"},"content":{"rendered":"

\"\"\u00a0 Per la versione in Italiano: <\/em>https:\/\/www.stradeeautostrade.it\/ponti-e-viadotti\/canakkale-bridge-un-simbolo-per-la-turchia-una-prodezza-per-lingegneria\/<\/a><\/p>\n

Canakkale 1915: the name of the bridge; 318: the height of the two towers; 2023: the length in meters of the main span which in this way allows it to hold the record for the longest suspension bridge in the world; red and white: the colors used to cover the towers and the caisson.<\/p>\n

These are the record numbers in a nutshell and let\u2019s see why they become a symbol.<\/p>\n

A bit of history\u2026<\/h4>\n

On March 18, 1915 we witness, in the battle of Gallipoli (\u00c7anakkale Sava\u015f\u0131 in Turkish), the victory over the Triple Entente of the Ottoman naval forces, led by the then 34-year-old lieutenant colonel Mustafa Kemal Atat\u00fcrk, who still today is considered as one of the events that gave rise to the birth of modern Turkey.<\/p>\n

2023 is the expected date of the opening of the bridge and centenary of the Turkish Republic (1923-2023). White moon and star on a red background: these are the colors of the Turkish flag.<\/p>\n

\"Turkey\"
1. In the construction of the longest suspension bridge in the world, italian skills and products were used to overcome the challenge of effective earthquake protection in areas of high seismicity<\/figcaption><\/figure>\n

Already from these \u201cmagically\u201d symbolic numbers it is clear that the new bridge under construction in Turkey over the Dardanelles cannot be just any bridge.<\/p>\n

The first idea of building a bridge over the Dardanelles dates back to 1989; later, in 1995, however, its impracticability was declared due to the seismic problems of the region and the aerodynamic complications.<\/p>\n

In 2010 the project was re-proposed within the program called \u201cTurkey Vision 2023\u201d, a massive development and investment program launched by Prime Minister Erdogan to make Turkey – on the occasion of its centenary – a modern nation and ambitiously projected to run as a candidate Bridgecountry between Europe and Asia through the construction of ports, airports, highways, hospitals, etc..<\/p>\n

The bridge is part of the modern Kivali-Balikesir highway currently under construction, worth USD 4.7 billion, which will connect Eastern Thrace and Anatolia avoiding passing through the Istanbul junction, which has now become a megalopolis for over 15 million inhabitants! Currently, in fact, all the \u201cland\u201d connections between Asian and European Turkey pass through the Bosphorus where there are three bridges and a tunnel.<\/p>\n

\"Bridge\"
2. The spherical bearing just finished assembling<\/figcaption><\/figure>\n

The Canakkale 1915 Bridge will cost USD 2.7 billion financed by 24 different Institutes from ten countries around the world and will have record numbers: the main span, with its 2.023 m will be the longest in the world and the suspended part will have a total length of 3.563 m (770+2023+770) which become 4.608 m also considering the two access ramps, respectively of 680 m and 365 m; the height of the towers of 318 m – like the Eiffel Tower – ranks sixth in the world among the tallest towers of suspension bridges!<\/p>\n

The three lanes for each direction of travel run at a height of almost 70 m above sea level to allow the passage of the numerous merchant ships that cross the strait; the metal body, 3.5 m high and 45 m wide, has a split deck design to address and solve aerodynamic problems.<\/p>\n

A specific structural system<\/h4>\n

Another undoubted problem that engineering has had to face is that of placing the bridge in a highly seismic area. In order to control the bridge\u2019s response to the strong dynamic actions – that is, an earthquake with a 2.475-year return period – a specific structural system using special spherical bearings and unique hydraulic devices both supplied by FIP MEC (https:\/\/www.fipmec.it\/<\/a>) was devised and implemented for the suspended deck.<\/p>\n

The bridge deck, supported by the cables over its entire length, is supported at the abutments by free sliding spherical bearings, allowing horizontal thermal movements up to \u00b11.525 mm along the longitudinal axis of the bridge.<\/p>\n

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