Arenas and Asociados S.L.

Santander, Spain

Arenas and Asociados S.L.

Santander, Spain
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Arenas J.J.,Arenas and Asociados S.L. | Capellan G.,Arenas and Asociados S.L. | Merino E.,Arenas and Asociados S.L.
fib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency, Proceedings | Year: 2011

Zadorra Viaduct represents an innovating structural system in the Spanish high-speed railway line, being pioneer in its typology. lt has a total length of 463 m, with three spans of 85.5 m, which is remarkable for a continuous box girder bridge for a high-speed railway viaduct. Not only its span length makes it an outstanding viaduct, but having designed two of these principal spans as hybrid. Every span was designed as a tapered box girder, varying from 6.6 meters on piers to 3.0 m in centre of span. The election of steel deck was not fortuitous, it was due to the construction process: the viaduct crosses over a high capacity highway and traffic shouldn't be interrupted, so cranes were selected as the best erection method, and the lightness of steel in front of concrete made its use convenient. The design of the connection between different material parts (concrete and structural steel) was one of the key points of the project. As said before, the viaduct crosses over the motorway of entrance in the city of Vitoria and also over Zadorra River, so there will be a great number of viewers that will cross beneath the structure. Therefore, piers and concrete surface texture have been designed and erected very carefully.


Arenas De Pablo J.J.,Arenas and Asociados S.L. | Miguel G.C.,Arenas and Asociados S.L. | Montesinos M.S.,Arenas and Asociados S.L. | Soto S.G.,Arenas and Asociados S.L.
fib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency, Proceedings | Year: 2011

Las Llamas' Bridge is settled in Santander (Spain) and crosses over the Atlantic Park, an area of great ecological and landscape interest, giving access to the University from the main entrance road to the city. The bridge has a main span between abutments of 102 m. The designed bridge is an arch with intermediate deck typology. The slender centre arch crosses 7.8 high over the deck in a length of 60 rn, continuing beneath the deck with two straight inclined legs reaching its bearings in plastic hinges 81.6 rn apart. The inclined legs continue underground until they reach its foundation on the exiting rock bed 9 m below. The bridge has been designed in high strength, self compacting white concrete C-60. The connection between arch and deck is materialized by means of stainless steel rod hangers. The deck is organized in a central box girder 5.8 m wide and 2.25 rn deep, with two lateral cantilevers, which are conceived as inclined precast slabs 9 m large with openings with light projectors to illuminate the green area under the bridge. Lateral sidewalks are paved with composite wood decking. Central reservation passing through the arch end openings holds a bicycle path.

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