Bridges and Their Design. History. Bridges have been used since the dawn of humankind Stone bridges became popular in the Roman era In the 19 th century, mathematics and physics became applied to design. What is a Girder Bridge?.
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Trusses don’t bend, they get pulled apart and pushed together.
However once the weight is increased the bridge will stag in the middle. This is due to the individual beams expanding and contracting due to the weight.
Trusses must be stable, and not able freely in any direction in order for them to work.
The beams have to be placed carefully in the right angles and in equal distances away from each other so they can distribute the weight equally.
They are usually supported at the ends by abutments and sometimes in the middle by piers.How Truss Bridges Work
This is the Beaver Railroad Bridge located in Carroll County, Arkansas
This is the ASB Bridge located in Jackson County, Missouri
The greater the degree of curvature (the larger the semicircle of the arch), the greater the effects of tension on the underside.Tension
-as the counterweights go down the bridge goes up and vise-versa.
Parallel Attachment Design
Radial Attachment Design
Great Seto Bridge in Japan
Clark Bridge in IL
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“Girder Bridge.” Wikipedia. 18 September 2006. http://en.wikipedia.org/wiki/Girder_bridge.
“Girder Bridges.” Matsuo Bridge Company. 1999. 18 September 2006. http://www.matsuo-bridge.co.jp/english/bridges/basics/girder.shtm.
“San Diego’s Coronado Bridge.” 20 September 2006.http://p.vtourist.com/386483-San_Diego_and_Coronado_Bridge-San_Diego.jpg.
“San Diego – Coronado Bridge.” 18 September 2006. http://www.coronado.ca.us/bridge.html.