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Transcript of Truss bridges
First Truss bridge constructed
Short Span Bridges
Middle "king post" takes most tension Made around the early 19th century
Variant of the Parker truss design
Idea to use short members
Tension is held in the arch
Compression is held in the "k" shaped supports
First K truss bridge made in 1917 K Truss Bridge Patented by James Warren in 1884
Simple and strong
Members can hold compression or tension depending on the loads' location
Used for airplane disignes in 1920's
Few truss bridges without vertical members
Similar to Neville truss Warren Truss Combo of Pratt and Camelback truss
Distributes stress better with more members and cables Parker Truss Designed in 1840 by millwright William Howe
Opposite of Pratt truss (members facing in)
Vertical members under tension
diagonal members under compression
Howe Truss 1852-1970
Designed by Wendell Bollman
Used for railroads
First metal bridge to be used commonly for railroads
Consisted of two span truss and had crossing support beam
Spaned about 160 ft.
Located in Maryland King Post Bridge Pros and Cons: Pros:
Strong enough to hold trains
Can span Large distances 70-150 Cons
Expensive (made of steel) Pros!!!
Can be made out of cheap materials Cons
Can't span long distances (10-60)
Not very strong Designed by Thomas and Caleb Pratt, 1844
Vertical members with supports angling to the the center
Baltimore, Pennsylvaina and Parker truss bridges based off it Pratt Truss Pros & Cons!!!!! Pros:
Spans long distances 200-400 ft.
Steel was more expensive in 1930's Bibliography: "RAILROAD BRIDGES." Brass Model Bridges at UNCLE DAVE'S BRASS MODEL TRAINS. N.p., n.d. Web. 06 Oct. 2012. <http://www.uncledavesbrass.com/BR-BRIDG.html>.
"Truss Bridge." Wikipedia. Wikimedia Foundation, 10 Apr. 2012. Web. 06 Oct. 2012. <http://en.wikipedia.org/wiki/Truss_bridge>.
"Speers Railroad Bridge." Historic Monongahela River Railroad (Norfolk Southern). N.p., n.d. Web. 06 Oct. 2012. <http://www.historicbridges.org/pennsylvania/speersrr/>.
"King Post." Wikipedia. Wikimedia Foundation, 09 June 2012. Web. 06 Oct. 2012. <http://en.wikipedia.org/wiki/King_post>.
"Model Bridge Design." Â» Pratt Truss. N.p., n.d. Web. 06 Oct. 2012. <http://www.garrettsbridges.com/design/pratt-truss/>.
"Team Agnes." Team Agnes. N.p., n.d. Web. 06 Oct. 2012. <http://teamagnes.wordpress.com/2009/06/07/bridge-project/>.
"Model Bridge Design." Â» Warren Truss. N.p., n.d. Web. 06 Oct. 2012. <http://www.garrettsbridges.com/tag/warren-truss/>.
"Model Bridge Design." Â» Warren Truss. N.p., n.d. Web. 06 Oct. 2012. <http://www.garrettsbridges.com/tag/warren-truss/>. Pros:
If the load is spread out it can be very strong Cons:
If the load is centered then it can break easier Pros:
Strong for how simple it is
Spans distances of up to 400 ft. Cons:
Can ware out because of the constant switching between tention and compression Pros:
Spreads stress out very well
Can span up to 250 ft. Cons:
Much more complex than most truss bridges Pros:
Can span up to 150 ft. Cons:
Very similar to Pratt truss