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cable-stayed bridges
 

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                   CABLE-STAYED BRIDGES

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Most cable-stayed bridges have 2 towers, just like suspension bridges.

But the cables found on suspension bridges, which hang down between the 2 towers, do not support the deck or roadway. The suspenders are the vertical cables that connect the main cables and the deck. 

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In a cable-stayed bridge, the cables run in straight lines from the tower to the deck.

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The main span ( distance between the towers) on this bridge is almost 6 feet.

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This is the same tower we used for the suspension bridge- 2 #6 beams supported by a pair of #3 beams.

The base is made up of 4 #4 beams connected by a pair of #3 beams- that's what the brick anchorage sits on.

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The deck cantilevers out from the tower. That means it's connected at one end to the tower and the other end is supported by the cables (the white 1/8" line).  To increase the span of the bridge, we hung another deck section, between the 2 cantileved decks.

Ian demonstrates how to assemble the bridge

The students in Vancouver assembled this cable-stayed bridge and loaded it to failure.