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SAMUEL BECKETT BRIDGE_ SANTIAGO CALATRAVA

Samuel beckett bridge

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Page 1: Samuel beckett bridge

SAMUEL BECKETT BRIDGE_

SANTIAGO CALATRAVA

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LOCATION OF THE BRIDGE

NORTH QUAY

SOUTH QUAY

DUBLIN DOCKLANDS

LOCATION - The Samuel Beckett Bridge links the north-side and south-side of the city of Dublin over the River Liffey.To the north is the North Wall Quay and to the South is the Sir John Rogerson's Quay.

(A quay is a structure built parallel to the bank of a waterway for use as a landing place).

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INTRODUCTION TO THE BRIDGE

CONCEPT - The Bridge was designed with the aim of being a statement of ambition for the area, rejuvenating the north and south sides of the river as well as forging a new link between the affluent south and less affluent north.

It is a landmark, the dramatic shape of the bridge resembles the Irish harp, a symbol for its secularity.

TIME FOR CONSTRUCTION - May 2007 to December 2009.

DESIGN - The bridge has been designed by Santiago Calatrava who also designed the James Joyce Bridge which is further upstream.

TYPE OF BRIDGE - The bridge is a cable-stayed, steel box girder structure with a span of 120 metres between north and south quay walls, and is 48 metres high.

SPECIFICATIONS - •The bridge has four traffic lanes, with cycle tracks and footpaths on either side.• It is also be capable of opening through an angle of 90 degrees allowing ships to pass through.

FINANCE - The total cost of the project was estimated at € 60 million, which will also include a major upgrade of the approach roads.

The project is being funded by the Department of the Environment, Heritage and Local Government, the Dublin Docklands Development Authority and Dublin City Council.

The design for the bridge was influenced by the Irish harp

The Bridge steel superstructure travelled from Rotterdam by barge following its fabrication.

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TYPES OF BRIDGES

BASIC TYPES OF BRIDGES

Suspension Bridge•Used when a large distance, such as a river or estuary, has to be bridged in a single span.• Typically two large supporting cables (called ‘suspenders’) are anchored at each side and fixed to the tops of the towers.• The rest of the structure is suspended from these two cables.

CABLE-STAYED CANTILEVER BRIDGEThese differ from suspension bridges in the following ways:

• There is no single suspender cable• The suspension cables are attached to the tower(s) and to the deck and

are not vertical• The deck is attached to the tower(s)

• There may be only a single tower or pylon.

Beam Bridge

A typical suspension bridge

Typical Cable-stayed cantilever bridge

Simple Cantilever Bridge

Samuel Beckett bridge

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TRANSFER OF FORCES IN A CABLE STAYED BRIDGE

• A cable-stayed bridge can be constructed using just one tower.• The tower is usually placed in the middle of the river The weight of one side of the bridge would balance the weight of the other side. • Cables run from the tower to the road deck.

BASICS OF THE CABLE-STAYED BRIDGE

The Samuel Beckett Bridge

Cable pulls up the cantilever

Forces from the cable transferred downwards, to the support of the bridge.

The forces on either side of the support are still not balanced

The support itself is tilted, and cables are added on the other side to balance the forces.

Cantilever bridge

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T T

C

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TRANSFER OF FORCES IN A CABLE STAYED BRIDGE

•The Samuel Beckett Bridge has a span of 120 metres. •Its single support is 28 m from the South quay and the bridge can be turned through 90° to facilitate marine traffic.

The Structure of the Samuel Beckett Bridge•The bridge deck has a box-girder structure which provides rigidity. •The load is transferred and dissipated (spread) throughout the structure of the bridge deck and into the cable-stays. •The cable-stays are in tension and the load is transferred to the pylon which in turn transfers the load to the bridge’s foundation, and in turn to the ground.•The pylon is in compression.

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STRUCTURE AND ROTATION OF THE BRIDGE

Rotating around one end

CABLE - STAYED SWING BRIDGE

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STRUCTURE AND ROTATION OF THE BRIDGE

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STRUCTURE AND ROTATION OF THE BRIDGE

Rotating a BridgeA swing bridge rotates horizontally about a vertical axis. A braking system is required to slow the rate of rotation and bring the bridge to rest at specified points.

Rotating Balanced StructuresThe structure on top is unbalanced.A balanced structure could be made:• by moving the axis of rotation tothe centre, or• by adding a counterweight whilemaintaining the same overalllength as shown in the diagram.The power required to rotate thesestructures would be considerablyless– and because they are both balanced there would be relatively little rotational force on the bridge support.

Rotating around one end

Rotating balanced structures

Balance•In the case of a structure that rotates around a single support it is desirable to eliminate unbalanced forces. •This is usually done by adding a suitable counterweight. The shorter end of the Samuel Beckett Bridge has almost 2500 tonnes of steel, lead and heavy concrete added to it so that the centre of gravity of the whole structure is directly above the pivot. •The bridge is then in equilibrium.

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Pier Details

STRUCTURE AND ROTATION OF THE BRIDGE

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STRUCTURE AND ROTATION OF THE BRIDGE

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BIBLIOGRAPHY

•http://www.bauforumstahl.de/upload/documents•DublinCityCouncil.pdf