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The Howe truss used iron vertical rods in tension with wooden diagonal braces. Both trusses used counter-bracing, which was becoming essential now that heavy railroad trains were using bridges. [1] In 1830, Stephen Harriman Long received a patent for an all-wood parallel chord truss bridge. Long's bridge contained diagonal braces which were ...
Which chord carries tension and which carries compression depends on the overall direction of bending. In the truss pictured above right, the bottom chord is in tension, and the top chord in compression. The diagonal and vertical members form the truss web, and carry the shear stress. Individually, they are also in tension and compression, the ...
Special features of the bridge include large side openings and a truss made of two crossed Howe truss members on each chord. [4] The bridge is 60 feet (18 m) long. [4] It was added the National Register of Historic Places in 1979. [1]
HAER diagram of a Long truss. The Long truss was designed by Stephen H. Long in 1830. The design resembles a Howe truss, but is entirely made of wood instead of a combination of wood and metal. [21] The longest surviving example is the Eldean Covered Bridge north of Troy, Ohio, spanning 224 feet (68 m). [22]
The Rexleigh Bridge employs "the patented Howe truss, with paired diagonal timbers, single timber counters, and multiple vertical iron rods defining each truss panel. The diagonals and verticals are connected to the upper and lower chords by means of cast-iron bearing blocks."
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.
Pratt truss Pasco–Kennewick Bridge: 1922 removed 1990-07-16 Pasco: Franklin: Cantilever through truss Prosser Steel Bridge: 1911 removed 1990-07-16 Prosser: Benton: Weyerhaeuser Pe Ell Bridge: 1934 removed 1990-07-16 Pe Ell: Lewis: Timber Howe truss, pony truss: Winslow Railroad Bridge: 1916, 1917 removed 1999-12-15 Colville: Stevens: Howe ...
The McConnell's Mill bridge is particularly significant for its usage of the Howe truss design; it is one of only four extant Howe truss bridges statewide. [ 2 ] : 2 In 1980, the bridge was recognized for its historical significance by being placed on the National Register of Historic Places , [ 1 ] along with the Banks Bridge.