A bar is a supporting element in the construction. By its shape and the material properties of the beam is suitable for many uses. The name of the function of the beam, the installation location or after the material is common.
History of the term bar in carpentry has only referred to the wooden beams, the Association is the timbers or beams. Later, the term is useful to other identical components made of different materials, such as structural steel or reinforced concrete, gone. Related is the balcony ( porch at the cantilever ).
, Bar ' is a component -related expression: A geometrically defined cross section (square, round, rectangular), according to usance about 200 mm, in relation to a great length, determine its shape. Its more equal level in cross section differs from the beam components such as plank, plank, and others.
The bar is in contrast to the rod loaded perpendicular to its longitudinal axis. It may take up forces in the longitudinal and transverse direction, size, material and shape determine the use. The field of structural engineering that deals with the beam, the beam theory.
Functionally referred to horizontal beams as a support, only one side clamped cantilever beam, standing charged when spanning building openings fall in frame as a bolt in the roof structure as purlin, and others depending on the application, vertical bars as column as Stayers, stalk, charged or unencumbered as posts, hanging on train loaded slopes column. Weird beams can be found under names such as rafters ( roof), as a brace (technical trusses ), headband, bow ( diagonal strut in timber frame ), and much more. The series of bars next to each other, for the purpose of masking area is horizontally covering the joists vertically with horizontal bars that block plant, with upright beams the stud frame.
The wooden beams, regional and tram, now commonly results from sawing a tree trunk ( timber ) in the longitudinal direction. The fiber direction thus runs in cutting direction. Previously beams were often made by hewing with the adze. Here, the bar is the strongest class of timber, and is also simple, tree named ' (as it has received in ships, cranes, or roof structures as an expression )
The possible use is made very large, for example, in the half-timbered and ceiling construction (wood beam ceiling ) to completion.
Beams are fabricated by selective disassembly of a tree trunk: A distinction is sharp-edged and lack edged beam. False -edged beams do not have contour remains of the tree trunk. After the possible longitudinal division of the tree trunk and use the maximum tribal cross section show a square or a rectangular whole wood (one bar ), half wood ( two bars), quarter timber ( four bars) or sixth wood ( six bars).
The bar end is also called the beam head and can wear visible ornaments in special cases.
All connectivity options and types of machining of wood are the most common beam and determines the type of installation.