Pelješac bridge

Contact

Steve Thompson. Ramboll

Steve Thompson

Specialist cable-stayed bridges
T: +44 7435 751 525

Stanislav Karminski

Senior Consultant
T: +46 72 589 70 73 x072

Pelješac Bridge is a new 2,4 km extradosed bridge across the Mali Ston Bay over the Adriatic Sea connecting Dubrovnik-Neretva County with the rest of Croatia. The 13 span extradosed bridge includes 5 main spans of 285m, providing 4 traffic lanes, in a region of high seismicity. JV led by China Road and Bridge Corporation (CRBC) is building the bridge. 

Ramboll services

Ramboll is providing Detailed Design Independent Proof Check services and Design Review team throughout the design and construction phases, ensuring that the design and construction is conducted with respect to the project requirements through the detailed design drawings and structural design. The independent check was fully coordinated and customized to suit off site fabrication and on site construction processes with tight deadline. 

Construction

Construction involves heavy civil works for deep foundations based on 36 No. piles over 124 m in length. In addition, superstructure erection involves handling of large steel deck segments,  deck launching operations and  balanced cantilever construction. All methods were taken into consideration during the detailed design of the project. 

Ramboll assisted the Client in the check and compliance review process and enabled prompt approval of independent review  of detailed design.

General arrangement

The total crossing length is 2.4km, comprising an extradosed cable-stayed system with five main spans of 285m with 200 m wide and 55 m high navigation corridor.  There are a total of 13 No. piers consisting of hollow reinforced concrete box cross section with 0.7-0.8 m thick walls varying in height between 19.2 and 31.8 m. All 6 extradosed pylons are 40 m high, having solid concrete cross section and anchoring 10 cable stay anchorage link fabrications distributed evenly every 2 m.

The superstructure is constructed as a continuous hybrid box girder consisting of steel box over the spans and prestressed concrete power joints at the pylons.  Suspension of the main spans is made by 10 stays connected to the pylon links and superstructure in height-to-span ratio 0.14. The orthotropic steel deck is 22.5 m wide and 4.5m deep.

The bridge is located in a high seismicity zone with ground acceleration on the bedrock level of ag = 0.34 g. During the past century there have been 7 earthquakes occurring within 100 km of the site with a magnitude over 6 on the Richter scale.

The bridge is exposed to the strong winds with a reference wind speed over 30 m/s at 10 m height and gust speeds up to 50 m/s.  Comprehensive wind testing has been conducted in the wind tunnel on the model scale 1:70 to prove bridge aerodynamic stability. Wind protection has been achieved by fitting transparent wind shields along the entire main girder edges. 

Bridge piers are founded on steel/composite piles with a diameter of 1800 and 2000 mm anchored in the pile cap cast at sea level. Tubular steel piles were driven by means of a heavy hydraulic hammer that was placed on a large derrick barge, employing the cutting-edge offshore technology. The piles are driven in one continuous length and are possibly some of the longest continuous driven steel piles in the world having lengths over 124 m. 

The bridge opened on July 2022.

Ramboll

Ramboll
First Floor, Emerald Building
Oud Metha Road
PO Box 116921, Dubai, UAE
Tel:+971 4 334 3616
Fax:+971 4 334 3617

Mail: info@ramboll.ae

Other sites

Other sites