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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Works well with most applications
Used for longer bridges with curvesAdvantages…
Cannot be used on bridges with curves (subject to torque)
Cannot span long distances
More difficult to fabricate than I-beams
A truss is an interconnected framework of beams designed to hold something up.
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 natural curve of the arch and its ability to dissipate the force outward greatly reduces the effects of tension on the underside of the arch.
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.
Cable-Stayed Bridge extending from opposite sides of the obstacle to be crossed, meeting at the center.
Parallel Attachment Design
Radial Attachment Design
Examples extending from opposite sides of the obstacle to be crossed, meeting at the center.
Great Seto Bridge in Japan
Clark Bridge in IL
“Box Girder Bridge.” 18 September 2006.
“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.