The bridge was constructed as part of infrastructure improvements for Expo 92 , which was held on large banana farms on the island. Construction of the bridge began in and was completed in from a design by Santiago Calatrava. The static concept of the bridge can be traced back to the sculpture by Calatrava entitled 'Running Torso', in which inclined stacked marble cubes are balanced by a tensioned wire. Since the weight of the tower is made to be sufficient to counter-balance the deck, back stays are thus not required, effectively substituting the weight of an inclined tower for one set of stay cables. In this way, a new type of cantilever spar cable-stayed bridge was conceived in
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The bridge was constructed as part of infrastructure improvements for Expo 92 , which was held on large banana farms on the island. Construction of the bridge began in and was completed in from a design by Santiago Calatrava. The static concept of the bridge can be traced back to the sculpture by Calatrava entitled 'Running Torso', in which inclined stacked marble cubes are balanced by a tensioned wire.
Since the weight of the tower is made to be sufficient to counter-balance the deck, back stays are thus not required, effectively substituting the weight of an inclined tower for one set of stay cables. In this way, a new type of cantilever spar cable-stayed bridge was conceived in The original intent was to build two symmetrical bridges on either side of the island, but in the end the Alamillo's singular asymmetric design has proved most striking.
The bridge deck consists of an hexagonal steel-box-beam spine to which the stay cables are attached. Side steel wings cantilevered off the hexagonal spine support the traffic decks, three lanes on each side. The top of the hexagonal spine, elevated 1.
This bridge represented the soaring aspirations of the city of Seville in preparation for Expo '92 , and is visible from the top of La Giralda , the former minaret which is the sentimental roof of the city, linking Seville's past and present. Similar to the Brooklyn Bridge, there is an elevated walkway for pedestrians. In addition to the elevated walkway, the Alamillo Bridge features a lookout at the top of the inclined tower, accessible by an stairway enclosed within the tower.
The Alamillo Bridge is the first cable-stayed bridge that is balanced solely through the weight of the massive tower, not requiring any type of back stays or anchorage.
There are 54 steel piles under the bridge, acting passively under the tower. While the Alamillo Bridge is dramatic and widely acclaimed aesthetically,  an analysis of its structural engineering show that it has an inefficient dynamic structural form because of the lack of backstays or anchorage to provide a restoring force under changing loads. One indication of this is the extreme weight of the pylon member needed in the Alamillo Bridge compared with other cable-stayed bridges such as the Erasmus Bridge in Rotterdam, which has a backward-inclined pylon and backstays.
The total mass of the pylon of the Alamillo Bridge is over 10 times the pylon mass of the Erasmus Bridge, which has even a longer span than the Alamillo. From Wikipedia, the free encyclopedia. Alamillo Bridge. Retrieved 11 May August What Is a Bridge? The Making of Calatrava's Bridge in Seville. MIT Press. Retrieved 13 May October ASCE library. Journal of Bridge Engineering 18 10 , Hidden categories: Articles containing Spanish-language text Commons category link is on Wikidata Coordinates on Wikidata.
Cantilever spar cable-stayed bridge with no backstays or anchorage. Wikimedia Commons has media related to Puente del Alamillo.
If you can see this, then your browser cannot display the slideshow text. Leaning tower: An irregular roughly heaxagonal cross section with average dimensions 12 m. See slideshow pictures Bridge deck: A complex beam comprising of the sentences described below. See slideshow pictures and Supporting cables: 13 pairs of stays every 12 m.
The initial idea involved creating a twin brother, an identical bridge tilted in the opposite direction on the other channel of the Guadalquivir River. In this initial project, only one was erected, because the budget was not sufficient to cover the pair. As in almost all the work of Calatrava, there is some controversy over the work, in particular concerning its structure. The proof is that the cables that support the bridge are not tight at the top of the mast, contrary to what one would expect. With the implementation of this project by Santiago Calatrava, achieved the following objectives:. The top of the mast is actually a lookout. Access is by a staircase inside the core of the mast.