Sloboda Bridge

Original version of Sloboda Bridge over Danube in Novi Sad, Serbia was designed by professor Nikola Hajdin and built in 1981. The cable-stay suspension bridge 1,312 meters long and carrying a six-lane highway, was badly damaged by NATO in air action in April 1999.

Scope of reconstruction project of cable stay Sloboda Bridge with spans 60+60+371(main span)+60+60m involves main steel three cell box girder span, two approach composite box girder span (each 60m), 4 reinforced concrete bridge piers, two pylons, stay cables in single plane, asphalt pavement  of bridge deck.

The German company DSD Dillinger Stahlbau GmbH won the EAR’s international tenders as general contractor for the reconstruction project (€43 million) and the supervision contract was awarded to Louis Berger S.A. France. Reconstruction has been designed by DELING’s engineers Aleksandar Bojovic and prof. Serif Dunica. The overall project has been managed European Agency for Reconstruction (EAR) and financed by European Union. The City of Novi Sad as the owner of the bridge has been the Employer as defined in the international Conditions of Contract (FIDIC) under which the contract was administered.

New segments for the bridge deck were manufactured in three factories GOSA – Smederevska Palanka (Serbia), MIN – Nis (Serbia) and FAKOM – Skopje (Macedonia).

All prefabricated segments have been delivered to shipyard in Golubac (Serbia) on the river Danube where then assembled into main sections weighing between 120 and 180 tonnes, before being loaded on the barges and shipped to Novi Sad which is some 220km upstream. Each segment has been first lifted from the barge  by means of Derrick crane to the underside of previous segment for weld preparation and final adjustment to be made.

Cable installation has been performed by BBR – Switzerland. Each  cable stay consists of four cables anchored at the top in the pylon and stressed from the deck level. Each cable consists of between 54 and 86 individual strands.

Bridge test programme, prepared by university of Belgrade, included the measurement of the deflection during all loading phases, rotation of pylon base, horizontal movement at the pylon top and local deformation (stresses) in seven cross-section. Up to 20 fully-loaded trucks each weighing 42,895 kg were used for test load.

New reconstructed Sloboda Bridge has been opened for traffic in October 2005.