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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 bridge is seven spans in length, with the three central spans constructed with 10-metre (34 ft) span Howe-Deck timber trusses. The trestles are supported on concrete sills. [2] Opened in 1908, it has three 10.4-metre (34 ft) timber truss spans and is a good example of the 9.8–10.7-metre (32–35 ft) deck Howe truss.
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.
The Burkeville Covered Bridge is a historic covered bridge, carrying Main Poland Road over the South River in Conway, Massachusetts.Probably built in 1870, it is a regionally rare example of a multiple kingrod bridge with iron tensioning verticals (a modified Howe truss system), and one of a few 19th century covered bridges to survive in Massachusetts.
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Rexleigh Bridge is a wooden covered bridge over the Batten Kill in Washington County, New York.It is one of 29 historic covered bridges in New York State.. Town and Howe truss designs were patented by Ithiel Town in 1820 and William Howe in 1840, respectively. [2]
A few two-lane bridges were built, having a third, central truss. [5] Many different truss designs were used. One of the most popular designs was the Burr Truss, patented in 1817, which used an arch to bear the load, while the trusses kept the bridge rigid. Other designs included the King, Queen, Lattice, and Howe trusses.
For more truss types, see truss types used in bridges. A large timber Howe truss in a commercial building. There are two basic types of truss: The pitched truss, or common truss, is characterized by its triangular shape. It is most often used for roof construction. Some common trusses are named according to their "web configuration".