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The first joist in 1923 was a Warren truss type, with top and bottom chords of round bars and a web formed from a single continuous bent bar. Various other types were developed, but problems also followed because each manufacturer had their own design and fabrication standards.
This type of truss is seen in a framed roof consisting of rafters and a ceiling joist, [13] and in other mechanical structures such as bicycles and aircraft. Because of the stability of this shape and the methods of analysis used to calculate the forces within it, a truss composed entirely of triangles is known as a simple truss. [ 14 ]
A truss connector plate, or gang plate, is a kind of tie. Truss plates are light gauge metal plates used to connect prefabricated light frame wood trusses. They are produced by punching light gauge galvanized steel to create teeth on one side. The teeth are embedded in and hold the wooden frame components to the plate and each other.
Parallam is the brand name for the product invented, developed, commercialized and patented by MacMillan Bloedel (now Weyerhaeuser). It is the world's only commercially manufactured and marketed parallel-strand lumber product.
The Warren truss is a prominent structural feature in hundreds of hastily constructed aircraft hangars in WW2. In the early parts of the war, the British and Canadian government formed an agreement known as the British Commonwealth Air Training Plan which used newly constructed airbases in Canada to train aircrew needed to sustain emerging air forces.
Website www.weyerhaeuser.com The Weyerhaeuser Company ( / ˈ w ɛər h aʊ z ə r / WAIR -how-zər ) is an American timberland company which owns nearly 12,400,000 acres (19,400 sq mi; 50,000 km 2 ) of timberlands in the U.S., and manages an additional 14,000,000 acres (22,000 sq mi; 57,000 km 2 ) of timberlands under long-term licenses in ...
wall-plates (at the top of timber-framed walls that support the trusses and joists of the roof). When jettying, horizontal elements can include: The jetty bressummer (or breastsummer), where the main sill (horizontal piece) on which the projecting wall above rests, stretches across the whole width of the jetty wall. The bressummer is itself ...
In 1951 Bloedel, Stewart and Welch merged with H.R. MacMillan to form MacMillan Bloedel Limited. [1] The two companies had timber holdings side-by-side and there was a natural synergy from this merger. Bloedel, Stewart and Welch held many timber resources and MacMillan was the first truly integrated forestry company in British Columbia.