The Yavuz Sultan Selim Bridge – formerly known as the Third Bosphorus Bridge – is a hybrid cable stayed/suspended system of total length of 2,164m, with a main span of 1,408 m, designed by the French engineer Michel Virlogeux and Jean- François Klein from the Swiss engineering office Tingénierie.
- The deck has been designed to host a total of 8 road lanes and 2 railway lanes, which results in a total 59 meters width (World record).
- At the top of the 300m tall concrete pylons, two main suspension cables are installed and are connected to the deck with hangers.
- The steel deck in the main span is then supported at its central third. The general cross section of the deck is composed of orthotropic slabs.
- Due to the significant traffic load acting on the narrow bridge girder, the bridge is stiffened with the addition of stays.
- They support the deck in the vicinity of the pylons: in the other two thirds of the main span length and for the approach viaducts in prestressed concrete.
- The bridge’s innovative design includes some specific features such as dampers for stiffening cables, pendular bearings under the concrete deck, a dehumidification system for the steel components and windbreakers at the girder’s tips.
setec tpi is commissioned for :
- The expertise and the certification of the project on behalf of the highway’s concessionaire, the Italo–Turkish Joint Venture Içtas-Astaldi.
- The counter-calculation of the effects due to wind, fatigue of steel components, as well as the dynamic behaviour of the stays.
- With the help of setec its, also checked the electrical & mechanical facilities: dehumidification, fire hydrant system, low and high voltage equipment, lightning, maintenance lifts etc.
- terrasol analysed the project’s foundations.
Overall, more than 5,000 documents were reviewed over the course of the project (3 years).
All the calculations were carried out with the use of setec tpi’s in-house finite element software Pythagore considering turbulent wind and non-linear analysis (buckling, friction behaviour of pendulum bearings, cable behaviour, large displacements).
Each of the construction steps of this innovative cabled system was modelled, which enabled an understanding of short-term and long-term behaviours of the bridge and the control of its geometry compared to the targeted vertical alignment.
Client: ICA ICTAS-ASTALDI ADI ORTAKLIGI
Partners: terrasol, setec ferroviaire, setec its
Duration: 2012 – 2016