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Named for their shape, bowstring trusses were first used for arched truss bridges, often confused with tied-arch bridges. Thousands of bowstring trusses were used during World War II for holding up the curved roofs of aircraft hangars and other military buildings. Many variations exist in the arrangements of the members connecting the nodes of ...
A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to ... Since most early trusses were made from unseasoned ...
The Romans substituted bronze for wood in the roof truss(s) of the Pantheon's portico which was commissioned between 27 BC and 14 AD. The bronze trusses were unique but in 1625 Pope Urban VIII had the trusses replaced with wood and melted the bronze down for other uses. The Romans also made bronze roof tiles.
It can be subdivided, creating Y- and K-shaped patterns. The Pratt truss was invented in 1844 by Thomas and Caleb Pratt. [29] [30] This truss is practical for use with spans up to 250 feet (76 m) and was a common configuration for railroad bridges as truss bridges moved from wood to metal.
A Howe truss is a truss bridge consisting of chords, verticals, and diagonals whose vertical members are in tension and whose diagonal members are in compression. The Howe truss was invented by William Howe in 1840, and was widely used as a bridge in the mid to late 1800s.
Also, they were often similar to the Jennings barn design of 1879 (patent #218,031) with no tie beam so there were no beams to interfere with a hay fork (horse fork) on a track system (hay carrier) for pitching hay which became popular c. 1877. The gambrel roof shape lends itself to plank truss construction and became the most popular roof type.
The Fink Truss Bridge was patented by Albert Fink in 1854. Albert Fink designed his truss bridges for several American railroads especially the Baltimore and Ohio and the Louisville and Nashville. The 1865 Annual Report of the President and Directors of the Louisville and Nashville Railroad Company lists 29 Fink Truss bridges out of a total of ...
A grid of lightweight bridging trusses and main trusses supported the floors. The trusses had a span of 60 feet (18 m) in the long-span areas and 35 feet (11 m) in the short span area. [113] The trusses connected to the perimeter at alternate columns, and were on 6-foot-8-inch (2.03 m) centers.