The Pedestrian bridge of Vallparadís Park is one of the biggest urban recreational areas of Catalonia and connects two old residential areas. The bridge offers an innovative aesthetic design and consists of three 33 m long simply supported spans. One of the requirements from the owner was to inte-grate an elevator to connect the ground level of the park with the bridge 11 m above. The elevator has been located 35 m from one of the abutments and also serves as support for the adjacent spans.
The three meter wide deck is supported by a double steel truss of variable depth. The bottom chord of each truss describes a parabolic arch in an inclined plane, a composition that evokes memories of the flight of three birds coming back to this recovered natural area. The final product is a clearly three dimensional structure of a light, sober and transparent design.
The structure consists of three equal simply supported trusses with a span of 33 m. The steel truss members are hollow tubes with different geometries and are made of steel plates. The 3 m wide deck is a composite steel-concrete structure with transverse floor girders connected every 1.83 m via Bernold type studs, with a 0.18 m reinforced concrete slab. These transverse beams are rigidly connected at their edges by the top chord of the trusses.
Construction of the bridge began by the end of October 2007, and was completed in April 2007. Once the concrete foundations, abutments and piers had been installed, the steel trusses were assembled on site in six sections – three segments for each truss – and welded together. After erection of two parallel sections of the trusses, transverse beams and lateral ribs were welded and placed at their final positions, without temporary piers. The concrete layer is placed after the steel structure in its final position using as a formwork of cold-formed steel sheets.
World Steel Bridge Conference 2007 “Innovative road and pedestrian bridges in urban areas” Juan A. Sobrino & Javier Jordán.