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Bridges - Project

Page history last edited by Beatriz Gamero 10 years, 2 months ago

 

Bridge Project: Alamillo Bridge

 

 

The communication needs of humans have led to the creation of different media like cars, boats, airplanes. In order to develop the communication will need to join at different geographical points, creating communication networks. Such networks are made ​​up of different components, including the bridges.

 

Hello my name is Beatriz Gamero and this is my bridge presentation.

 

A bridge is a structure built to cross physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle.

 

Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed, the material used to make it and the funds available to build it.

 

There are seven main types of bridges: beam, truss, cantilever,arch, arch tied, suspension, and cable-stayed.

So, there are many different designs that all serve unique purposes and apply to different situations therefore exist in a wide variety of sizes and the most common materials used are concrete, stone, wood, iron, and steel.

 

Alamillo Bridge

 

The Alamillo is cable-stayed bridge made by architect and engenieer Santiago Calatrava in Sevilla, Spain and crosses the Guadalquivir River. This bridge was a project for the Universal Exposition of Seville in 1992 (Expo 92).

Calatrava is characterized by the very high cost of their works that’s why this project was presented as an "incomplete project". His initial idea involves the construction of a twin bridge tilted in the opposite direction on the other channel of the Guadalquivir River.

 

The Concept

 

This bridge resembles a harp, so arguably is a reinterpretation of the musical object.

 

Technology involved in its construction

 

It was the first bridge in its kind. In contrast with traditional bridges; Alamillo´s Bridge has an asymmetrical shape.

The weight of the traffic and pedestrians bears down on the bridge deck which is just a sophisticated plank or beam so the beam works by bending but can only do that if it is supported. The bearings sit on the foundations and the cables are inclined so the deck is also compressed by a horizontal force that increases along the length towards the tower with each pair of cables, the tension in the cables also pulls on the tower.

These forces are balanced, not by some back stays as is usual, but by the weight of the considerable backwards lean of the massive tower.

 

Materials

 

The mast is made of hexagonal plates of steel, reinforced inside by reinforced concrete.

The bridge deck is designed as a metal structure and consists of a central platform and hexagonal anchorages where the cables attach.

The device is made through the corresponding transitions between the concrete and metal.

The cords are protected by epoxy resin, and the cable is surrounded by a sheath of high density polyethylene injected into the anchorages.

 

Bridge's Problems

 

Rain combined with wind action provoking vibration has been observed in the longest stays of the bridge. The maximum displacements observed are in the order of magnitude of 50cm and have caused discomfort problems to the pedestrian circulation across the bridge.  In 2004, a dynamic test in the cables was envisaged to measure the actual damping in the cables. It became clear that damping in the cables was very low and the solution required the installation of dampers. The damping devices had to be in accordance with the relevant aesthetic constraints of the structure. The installation of the damping devices took place during 2007. After the installation of the damping devices, a new dynamic test was carried out in February of 2008 to check if the level of damping introduced by the dampers was appropriate.

 

 

This Bridge is basically its work of art, because it is esthetical and functional. It became a characteristic symbol of Sevilla so, it is an attractive tourist spot.

 

Sources:

 

http://en.wikiarquitectura.com/index.php/Alamillo_Bridge

http://www.aviewoncities.com/seville/puentedelalamillo.htm

http://www.bridge-info.org/bridge/index.php?ID=19

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