PIANC Smart Rivers 2022

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In the harbour of Hamburg a new bridge crossing the Süderelbe at Elbe km 620 has  been  planned.  The bridge  is  part  of  the  BAB  26 motorway. Contracted by  DEGES, a German company for highway  planning and design, BAW determined the  ship impact loads on the basis and  methodology of [2]  and [3] on a site- specific basis [1]. The Süderelbe bridge crossing will have a length of 736 m with main span bridging the fairway over 350  m. The pylon height of the main piers is planned to be 140 m. The clearance height of the Süderelbe crossing should be 53 m  above sea level. The two pylons and main  piers  of  the  Süderelbe  bridge  crossing,  which  are  to  be  positioned  close  to  the  bank,  are  at  risk  of  ship  impact.  About 6,000 seagoing vessels up to 33,000 dwt  are passing the future bridge. Fleet structure, ship  passages, speeds,  accident  rates and nautical conditions were analysed  and  ship  impact  loads  for  the  piers  and  protective 	structures were determined using a load  model  on  one  hand  and  a  collision model on the other hand.  Load  and collision model are probabilistic and  based on corresponding distributions of the  decisive influencing parameters, whereby  this   approach   represents  state-of-the-art  technology. Based on the collision model, the average time that the eastern pylon is being impacted is expected to be 470 years, while the average time for the western pylon is expected to be 1,240 years. 
The impact loads for the east pylon are dynamic loads with FFdyn = 17.5 MN for frontal  impact  and  FLdyn = 4.0 MN for  lateral impact. Out of the models the  impact load can be determined as dependent on the distance of the piers (pylons) to the fairway center line. The variation of the span distance of the pylons show the plausibility of the developed and used modelling.

[1] BAW,  2016.  Ermittlung  von  Schiffsstoßlasten  für  die  Süderelbequerung  A26-Ost, Hamburg,Elbe-km  620.  Expert   opinion BAW-Nr. A395 100 10115, Karlsruhe.  
[2] EN 1991-1-7, 2006. Eurocode 1: Basis of design and actions on structures – Part 1.7: Actions on struc-tures – Accidental actions due to impact and explosions.  
[3] DIN EN 1991-1-7/NA, 2010. Eurocode 1: Einwirkungen auf Tragwerke - Teil 1-7: Allgemeine Einwirkungen, Außergewöhnliche Einwirkungen; Nationaler Anhang. Beuth-Verlag.

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