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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.
The Howe truss, patented in 1840 by Massachusetts millwright William Howe, includes vertical members and diagonals that slope up towards the center, the opposite of the Pratt truss. [15] In contrast to the Pratt truss, the diagonal web members are in compression and the vertical web members are in tension.
Howe-type truss beam. The Rivières Bridge is the only bridge in Quebec to feature a Howe truss. [3] This truss is composed of interlocking beams whose punches have been replaced by steel tie rods. The tie rods are fitted with tensioners for periodic adjustment. This was the first truss to combine metal and wood. [4]
Covered Howe truss: Chitwood Bridge: ca. 1930: 1979-11-29 Chitwood Road over Yaquina River, Chitwood: Lincoln: Covered Howe truss: Coos Bay Bridge No. 01823: 1936 2005-08-05 US 101 over Coos Bay, North Bend
It is a relatively rare example of a Howe truss bridge, one of three in Missouri. The covered bridge is named for Sandy Creek, which it crosses, and was added to the National Register of Historic Places in 1970. [6]
The Union Covered Bridge is the only Burr-arch truss covered bridge still extant in Missouri; the other three covered bridges remaining in Missouri are examples of the Howe truss. The Burr design uses multiple king posts and an arch to support the bridge's truss. The Union Covered Bridge specifically has two arches on either side of the bridge. [6]
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Town and Howe truss designs were patented by Ithiel Town in 1820 and William Howe (architect) in 1840, respectively. [2] The Eagleville Bridge employs "the patented Town lattice truss, consisting of top and bottom chords of laminated wood plank, and a web of diagonal wood planks connected by wood trunnels at each point of intersection". [2]