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The only maintenance a Howe truss requires is adjustment of the nuts on the vertical posts to equalize strain. [1] The diagonals in a wooden Pratt truss proved difficult to keep in proper adjustment, so the Howe truss became the preferred design for a wooden bridge [1] or for a "transitional" bridge of wood with iron verticals. [2]
The Pennsylvania (Petit) truss is a variation on the Pratt truss. [26] The Pratt truss includes braced diagonal members in all panels; the Pennsylvania truss adds to this design half-length struts or ties in the top, bottom, or both parts of the panels. It is named after the Pennsylvania Railroad, which pioneered this design.
Only a few single-lane Pratt truss bridges remain in California today. The Hansen Bridge is closely tied to the community planning and development of Downieville in Sierra County, particularly in its role following the 1937 Downieville flood. It serves as a notable example of the truss bridge design. Its period of significance spans from 1935 ...
The Pratt truss was patented in 1844 by two Boston railway engineers, [18] Caleb Pratt and his son Thomas Willis Pratt. [19] The design uses vertical members for compression and diagonal members to respond to tension. The Pratt truss design remained popular as bridge designers switched from wood to iron, and from iron to steel. [20]
The Pratt truss was invented in 1844 by Thomas and Caleb Pratt. A Pratt truss has vertical members and diagonals that slope down towards the center. The interior diagonals are under tension, and the vertical elements are under compression. The Pennsylvania truss is a variation on the Pratt truss. While the Pratt truss has braced diagonal ...
The Jennings Randolph Bridge, built in 1977, is the largest Pratt truss bridge in North America. It spans ~3,400 feet (1,000 m) over the Ohio River between Chester, West Virginia and East Liverpool, Ohio, with main span of 745 feet (227 m). The bridge is located on U.S. Route 30 and is named after U.S. Senator Jennings Randolph (D-WV).
The New Hampton bridge is one of three remaining composite cast iron and wrought iron Pratt truss bridges built by Cowin in New Jersey. The others are the Glen Gardner Pony Pratt Truss Bridge (1870) in Glen Gardner and the Main Street Bridge (1870) in Clinton. The single-span bridge is 85 feet (26 m) long and 16.2 feet (4.9 m) wide. [4]
Pages in category "Pratt truss bridges in the United States" The following 200 pages are in this category, out of approximately 281 total. This list may not reflect recent changes .