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The most ancient form of timber bridge is the log bridge, created by felling a tree over a gap needing to be crossed. [ citation needed ] Among the oldest timber bridges is the Holzbrücke Rapperswil-Hurden crossing upper Lake Zürich in Switzerland; the prehistoric timber piles discovered to the west of the Seedamm date back to 1523 B.C.
The bridge was designed to support more than six times its intended load. [15] The two large, vertical buttresses or supporting pillars on either side of the arch, while aesthetically pleasing, are functionally unnecessary. Engineers of later arch bridges such as the Frederick W. Panhorst Bridge omitted them from the design. [16]
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 Mistissini Bridge in Mistissini, Quebec, Canada, is a 160-meter-long bridge that crosses the Uupaachikus Pass. Designed by Stantec and completed in 2014, the Mistissini Bridge employs the use of locally sourced CLT panels and glue-laminated timber girders to serve as the main structural members of the bridge. [ 33 ]
A trestle bridge is a bridge composed of a number of short spans. Each supporting frame is a bent. Timber and iron trestles (i.e. bridges) were extensively used in the 19th century. [28] A covered bridge is a timber-truss bridge with a roof, decking, and siding, which creates a nearly complete enclosure. [29]
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The Chow Chow Bridge was an early, wooden cable-stayed bridge crossing the Quinault River on the Quinault Indian Reservation near Taholah, Grays Harbor County, Washington. It was built for the first time in 1952 and finally removed in 1988. Frank Milward designed the bridge for Aloha Lumber Company. [1]
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