Red Covered Bridge in Traditional Golden Light 20210212a is a photograph by Wingsdomain Art and Photography which was uploaded on February 12th, 2021.
Red Covered Bridge in Traditional Golden Light 20210212a
Red Covered Bridge in Traditional Golden Light 20210212... more
Title
Red Covered Bridge in Traditional Golden Light 20210212a
Artist
Wingsdomain Art and Photography
Medium
Photograph - Photoart
Description
Red Covered Bridge in Traditional Golden Light 20210212
Typically, covered bridges are structures with longitudinal timber-trusses which form the bridge's backbone. Some were built as railway bridges, using very heavy timbers and doubled up lattice work. Most bridges were built to cross streams, and the majority had just a single span. Virtually all contained a single lane. A few two-lane bridges were built, having a third, central truss. 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. Early trusses were designed without an understanding of the engineering dynamics at work. In 1847, American engineer Squire Whipple published the first correct analysis of the way a load is carried through the truss, which enabled him to design stronger bridges with fewer materials. The longest covered bridge ever built was constructed in Pennsylvania between Lancaster County (Columbia) and York County (Wrightsville). This bridge was over a mile in length and was completed in 1814. About 14,000 covered bridges have been built in the United States, mostly in the years 1825 to 1875. Today, surviving bridges are numbered at fewer than 1,000 by the United States Department of Transportation, and at 814 by The National Society for the Preservation of Covered Bridges as of 2009. The first known covered bridge constructed in the United States was the Permanent Bridge, completed in 1805 to span the Schuylkill River in Philadelphia. However, most other early examples of covered bridges don't appear until the 1820s. Extant bridges from that decade include New York's Hyde Hall Bridge and Pennsylvania's Hassenplug Bridge, both built in 1825, and the Haverhill - Bath Covered Bridge and the Roberts Covered Bridge, in New Hampshire and Ohio respectively, both built in 1829. The longest, historical covered bridges remaining in the United States are the Cornish - Windsor Bridge, spanning the Connecticut River between New Hampshire and Vermont, and Medora Bridge, spanning the East Fork of the White River in Indiana. Both lay some claim to the superlative depending upon how the length is measured. In the mid-1800s, the development of cheaper wrought iron and cast iron led to metal rather than timber trusses. Metal structures did not need protection from the elements, so no longer needed to be covered. The bridges also became obsolete because most were single-lane, had low width and height clearances, and could not support the heavy loads of modern traffic. -wikipedia
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February 12th, 2021
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