tuesday 17 Ottobre 2017Dalle 16:30Third bridge on Bosphorus

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Event Details

An elegant hybrid solution to cross the Bosphorus strait with a mixed-traffic bridge, in an ever-expanding urban context

The steadily growing demand for transport in relation to the urban development, as in Istanbul, is unavoidable within large metropolitan areas and it requires new solutions, especially where the city develops on the borders of two continents.
In 2014 Istanbul was estimated to have a population of about 14 mln inhabitants, however seems to rise up to over 17-18 mln, more than half of whom are residing in Asia but whose working activities are 90% based in Europe, so the passage of the Bosphorus is he critical aspect.
Since August 2016 a new infrastructure exists, is the North Marmara motorway – four-lane per each direction – meaning a length exceeding 100 km, a section of which includes the Yavuz Sultan Selim bridge, 3rd bridge over the Bosphorus (hereinafter called BB3), executed by ICA, a Turkish-Italian joint venture, formed of Içtaş and Astaldi.
For the first time ever, this bridge combines two different transport solutions – rail and road – in the same level of the same infrastructure and, at present, it is the most important bridge being built in the world. It is a 2 km long bridge, whose main span is 1,408 m long, characterized by a hybrid solution, combination of cable-stayed and suspension solutions with an orthotropic deck of a width of 58.5 m, accommodating a two-carriageway motorway bridge with four lanes per each direction, separated by a double-track high-speed railway system for both freight and passenger transportation purposes.
This solution, providing for a single-level deck, was influenced by the Severn (1966) suspension bridge – central span of 988 m length – for the first time a streamlined orthotropic box girder deck, which inspired also the 1st (1973) and the 2nd Bosphorus Bridge (1988), both over the Bosphorus.
It was decided to supplement the BB3’s structure with stay cables, operating as stiffening cables, close to the towers, so that the heavy and concentrated loads at quarter span are directly anchored to the corresponding tower, reducing deflections considerably.
Based on this technical assumption, the designers, Michel Virlogeux – Jean-Francois Klein (T engineering) and Vincent De Ville (Greish) – were able to conceive a suspension bridge provided with stiffening cables, which led to an elegant hybrid solution.
BB3 has a central span of 1,408 m in length, with two on-shore towers of 330 m in height.
It is a traditional orthotropic deck formed of 57 segments of a weight of approximately 900 t each, each segment 24 m long and 58.5 wide, with 5,50 m height.
BB3 is the longest bridge of this kind in the world, and it is also the longest stay cable bridge in the world, and the only one including a railway track.
The presentation will show all the design process, the tests, the execution and erection phases and many inn

Ing. Roberto SorgeAstaldi S.p.A. – Head of Engineering and Design Department

Prof. Alberto Taliercio, Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale, Coordinatore del Corso di Studi di Ingegneria Civile

The presentation will show all the design process, the tests, the execution and erection phases and many innovative aspects that have characterized this unique solution.

More Info: https://www.3kopru.com/eng/corporate/ICA/10 – http://www.astaldi.com/

Date e orari

martedì 17 Ottobre 2017
Dalle 16:30

Luogo

Politecnico di Milano, Aula S.0.5

P.zza Leonardo da Vinci, 32

Organizzatore

Politecnico di Milano

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