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The beam bridge is the most basic bridge type. It is
made of a horizontal beam resting on piers at each
end, like a wooden plank lying across two logs.
Beam bridges do not span long distances.
The reason for this is that they are weak in the
center. The piers support the weight of the bridge
and any traffic on it. The Lake Pontchartrain
Causeway in Louisiana is an exception to this.
This is a series of beam bridges connected together
for more than 23 miles (37 km). Adding piers close
together and shortening the span between them
makes a beam bridge longer and able to carry a
heavy load.
Le pont à poutres est le type de pont le plus
élémentaire. Il se compose de poutres horizontales
reposant sur des piliers à chaque extrémité,
comme une planche en bois placée sur deux
bûches. Les ponts à poutres ne peuvent pas être
très longs. En effet, leur point faible est au centre.
Les piliers supportent le poids du pont et des
véhicules qui passent dessus. La chaussée du lac
Pontchartrain, en Louisiane, est une exception à
ceci. Elle consiste en une série de ponts à poutres
en succession sur plus de 37 kilomètres. La
construction de piliers proches les uns des autres
et le raccourcissement de la longueur de la portée
entre les piliers permettent de construire un pont
à poutres plus long et capable de supporter une
charge lourde.
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Beam Bridge - Long Span
Pont à Poutres - Portée Longue
© 2018 Basic Fun, Inc. and its licensors. All rights reserved.
© 2018 Basic Fun, Inc. et ses concédants de licence. Tous droits réservés.
© 2018 Basic Fun, Inc. und deren Lizenzgeber. Alle Rechte vorbehalten.
© 2018 Basic Fun, Inc. en haar licentiegevers. Alle rechten voorbeh ouden.
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