Design of Raos Footbridge over the A-67 Motorway, Santander (Spain)

As part of the project "Santander's Bay Cycle Path", Arenas & Asociados was commissioned the design of a pedestrian and cycle bridge that should allow the connection between the neighborhoods of Nueva Montaña and Raos, in Santander (North of Spain). This paper tries to synthesize the main characteristics of the project.

The new footbridge is 210 m long, with a central steel structure section of 106 m and two reinforced concrete access ramps, with a 6% slope and lengths of 43 and 61 m. The structure has a slightly curved plan directrix, so to produce the minimum disruption to the existing infrastructures, maintaining the required distances and clearances.

The U-shaped main composite section, with a 1.20 m depth, allows the crossing over the A-67 motorway and two railway tracks, with two spans of 36 m. The grade-axis of the structure respects the vertical clearances of 5.50 m over the motorway, and 7.0 m and 6.5 m respectively over ADIF and FEVE tracks.

The identity of the footbridge is ist central main support, in a double V-shaped steel element, forming a tetrapod that supports both edge girders of the deck. The V pier has an opening of 15 m, reducing the effective main spans to an approximately length of 29 m, thereby reducing depths and efforts on the deck.

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