In this comprehensive classic manual, the author describes the use
of timber as bridge material, types of timber bridges, the
properties of wood and wood products, preservation and protection
of timber bridges, timber design concepts for bridges, loads and
forces on timber bridges, design of beam superstructures, design of
longitudinal deck superstructures, design of longitudinal
stress-laminated deck superstructures, rail systems for timber
decks, wearing surfaces for timber decks, timber bridge fabrication
and construction, bridge inspection of decay and other
deterioration, maintenance, rehabilitation and replacement of
timber bridges. This is a digitally recreated publication of the
original manuscript (1990), comprising over 900 pages, produced in
its entirety. Wood was probably the first material used by humans
to construct a bridge. Although in the 20th century concrete and
steel replaced wood as the major materials for bridge construction,
wood is still widely used for short- and medium-span bridges. Of
the bridges in the United States with spans longer than 20 feet,
approximately 12 percent of them, or 71,200 bridges, are made of
timber. In the USDA Forest Service alone, approximately 7,500
timber bridges are in use, and more are built each year. The
railroads have more than 1,500 miles of timber bridges and trestles
in service. In addition, timber bridges recently have attracted the
attention of international organizations and foreign countries,
including the United Nations, Canada, England, Japan, and
Australia.
General
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