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the secrets behind truss bridges
Transcript of the secrets behind truss bridges
and 1700's builders
around the world used
building material In 1500's the main
style for bridges
were the basic kingpost
and queenpost designs <- Kingpost bridge Queenpost bridge -> 2. 3. 4. 5. Europe invented a few wooden
truss bridges until the 18th
century and then and instead
switched to steel/metal truss
bridges along with the U.S. 8. 1. Why might truss bridges have roofs on top of them?
they were intended to protect the bridge from bad weather and it helped to make the bridge last three times longer! 6. In the mid 1700's, the U.S. had very limited transportation
because the Revolutionary War needed all the wood, steel, and metal they could get. 7. When the war ended, builders quickly gained materials again to start building wooden truss bridges 9. Lastly,In 1844, Caleb Pratt invented the pratt truss bridge 10. Bibliography
http://www.tdot.state.tn.us/bridges/historybridges.htm This bridge was designed to put together timber compression. Joseph B. Strauss Built the golden gate bridge 4 After reading about the Warren truss and learning how sturdy and strong the Warren truss is, we decided to build one. it was built because there was no other way to get across the bay besides fariy it costed 30 million dollors he choose it because its strong structure. james warren this bridge is built with triangles to spread out the weight of the loads By:Caitlyn 2 We did the Warren truss because it's the simpliest yet strongest bridge design. One of the things that makes the Warren truss different is it uses equilateral triangles. Equilateral triangles help spread out the weight of the load. The equilateral triangles minimize the forces to only compression and tension.This made an improvement over the old Neville truss. 1 Our group did the warren truss. 3 The Warren truss is often part of the structure professional designers use in bridge construction. The Warren truss quickly became a common type of contruction for bridges. Historians say that the Warren truss became common scenery for Americans. http://www.garrettsbridges.com/design/warren-truss/ http://www.wisegeek.com/what-is-a-warren-truss.htm BIBLIOGRAPHY http://www.ehow.com/info_8241582_different-types-truss-bridges.html