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he proposed structure will be located at the

eastern end of the Sea of Marmara, close to

Izmit and approximately 50 km from Istanbul,

urkey. Crossing the Bay of Izmit, the bridge (and con-

necting highway) will provide three lanes of traffic in each


CH2M HILL’s bridge professionals provided full, inde-

pendent detailed checking services which included a com-

prehensive assessment of seismic actions requiring state of

the art non-linear methods of analysis and a review of the

very extensive wind tunnel testing commissioned by the


The bridge is located close to the North Anatolian Fault

which is one of the most active earthquake zones in the

world. This has resulted in the adoption of special meas-

ures to resist seismic effects including the adoption of steel

inclusion piles to improve ground conditions below the

tower foundations.

These foundations are placed on a layer of gravel that

acts as a seismic fuse to dissipate energy under extreme

seismic loading. Extensive linear, non-linear, and dynamic

modelling was carried out including detailed finite element

models and complex modelling of the non-linear behaviour

of the seismic fuses.

Deck Construction

Crane service provider Aydin Vinc A.S. is tasked with mak-

ing sure the logistics run smoothly when constructing this

large-scale project – with the help of a new Sennebogen

5500 crawler crane with 180 t load capacity.

The Izmit Bay Bridge is being built around 50 km south-

east of Istanbul and will be the longest and most advanced

suspension bridge in the world.

(pix previous page)

A modern, six-lane suspen-

sion bridge is under con-

struction across the Sea of

Marmara near the Turkish

town of Izmit.

Customer Aydin Vinc A.S. is

using a 180 t Sennebogen

5500 crawler crane for

lifting and logistics tasks

where the bridge is being


Six lanes over the Sea of Marmara – starting in 2017, over 5,000 vehi-

cles per day will be able to cross the new Izmit Bay Bridge in Turkey.

With a main span of 1,550 m the Izmit Bay Suspension Bridge forms

part of the Gebze-Izmir expressway project being procured under a pri-

vatized concession arrangement.

Page 13

Contractors World International Vol 6 No 1