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A covered bridge is a timber-truss bridge with a roof, decking, and siding, which in most covered bridges create an almost complete enclosure. [1] The purpose of the covering is to protect the wooden structural members from the weather.
This 86.5-foot-long (26.4 m), 18.66-foot-wide (5.69 m), Howe truss bridge was built in 1855. It was renovated by the Works Progress Administration in 1939, and by the city of Philadelphia in 2000. [2] It is the only remaining covered bridge in Philadelphia and is the only covered bridge in a major US city.
The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts. [5]
Peter Paddleford (1785–1859) was a covered bridge builder who designed a new wooden bridge truss, one he never patented. The design was used widely throughout New Hampshire, Maine, and Eastern Vermont during much of the 19th century.
Examples of truss construction on covered bridges include Howe, Town Lattice, Queen-post, King-post, Haupt, Burr, Brown and Pratt. Of the existing historic covered bridges in Alabama, the Gilliland-Reese Covered Bridge and the Old Union Crossing Covered Bridge are classified as non-authentic based on their current construction.
There is a covered bridge in Frankenmuth, Michigan. There are at least 7 others throughout the state. U.S. Minnesota: Twenty-three covered bridges including one on the National Register of Historic Places. U.S. Missouri: Four historic covered bridges, all now listed as State Historic Sites. U.S. New Hampshire
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Below is a list of covered bridges in Kentucky.There are eleven surviving authentic covered bridges in the U.S. state of Kentucky, and they are all historic. [1] A covered bridge is considered authentic not due to its age, but by its construction.