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Architecture Design II

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Concepts And Research Of Spans

 

The Arch Bridge:  An arch bridge works by transferring the weight of its loads across it arch.  An Arch bridge is always under compression.  The force of compression is pushed outward along the curve and toward its abutments.  The greater the degree of curvature is the greater the amount of tension becomes.  The compression is the force downward from the road of walkway and the tension is the force outward from the bottom of the arch.  

http://suspensiondomes.com/introduction/graphics/arch_bridge.jpg

 

The Cable-Stayed Bridge:  A cable-stayed bridge is a bridge that consists of one or more columns.  These columns have cables that are attached to them to support the deck of the bridge.  This bridge is one of the best bridges to build because it is very stable in the wind and is less expensive to build then some of the other bridges.  The cables are extremely strong and very flexible.  Only a few cables can hold up the bridge, but their flexibility makes them weak to the forces of weather such as wind. 

http://www.dormanlongtechnology.com/images/Sutong_01.jpg

 

The Cantilever Bridge: A cantilever bridge is a bridge that is built using cantilevers.  A cantilever is a structure that projects horizontally into space and is supported on only one end.  When the cantilever is spanning a large area they use trusses to carry the weight.  The trusses are usually made out of steel.  They also use columns every so often when they want to keep the span going.  The columns could make from either structural steel or concrete. 

http://www.gammonindia.com/aos/bridges/big_jadukata.jpg