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Steel joists and Joist Girders being erected. In structural engineering , the open web steel joist (OWSJ) is a lightweight steel truss consisting, in the standard form, of parallel chords and a triangulated web system, proportioned to span between bearing points.
A girder (/ ˈ ɡ ɜːr d ər /) is a beam used in construction. [1] It is the main horizontal support of a structure which supports smaller beams. Girders often have an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape, or other forms. Girders are commonly used to ...
These joists land on a beam. Between some of the joists is a form of pugging used for insulation and air sealing. Image: Rijksdienst voor het Cultureel Erfgoed. Joists can have different joints on either ends such as being tenoned on one end and lodged on the other end. A reduction in the under-side of cogged joist-ends may be square, sloped or ...
Plate girder, formed by welding (or occasionally bolting or riveting) plates. I-beams are commonly made of structural steel but may also be formed from aluminium or other materials. A common type of I-beam is the rolled steel joist (RSJ), sometimes incorrectly rendered as reinforced steel joist.
Structural ironworkers also erect joist girders, bar joists, and trusses, and also install metal decking. When one bullpin is inadequate, the Ratliff Technique [citation needed] may be utilized in order to force a bullpin to align itself straight with a hole, by driving another bullpin or driftpin between a steel member, and the first bullpin.
Rotten LVL joists from the Berkeley balcony collapse. Because it is specifically sized to be compatible with I-joist floor framing, residential builders and building designers like the combination of I-joist and LVL floor and roof assemblies. LVL is considered to be a highly reliable building material that provides many of the same attributes ...
Metal deck and open web steel joist receiving spray fireproofing plaster, made of polystyrene-leavened gypsum. Steel loses strength when heated sufficiently. The critical temperature of a steel member is the temperature at which it cannot safely support its load [citation needed]. Building codes and structural engineering standard practice ...
Plate girder can be used for spans between 10 metres and more than 100 metres (33 feet to more than 330 feet). Stiffeners are occasionally welded between the compression flange and the web to increase the strength of the girder. A box girder or "tub girder" is, as the name suggests, a box shape. They consist of two vertical webs, short top ...