You may often find reference to bays and bay size in relation to steel framed buildings. This refers to the distance between the stanchions (or columns). So a building 30m long might be divided up into five 6m wide bays with six rows of stanchions including two end gables. Each bay will span the width of the building. [...]
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STANCHIONS are the steel columns that form the upright posts in a portal framed steel building. They can be formed from heavyweight hot rolled steel “I” beam sections or from lightweight cold rolled galvanised steel “C” sections bolted back to back to form a strong composite “I” beam. The main stanchions should never be comprised [...]
Baseplates are used to hold a portal framed steel building down to the foundation pads or base slab. They should be fabricated form steel plate comprising a thick bottom plate which is bolted to the concrete, with a welded upright to which is bolted the steel stanchion. The baseplate will normally resemble an upside down “T”.
TP Structures recently completed a new steel framed building for Stirling Council to provide a bagging plant at their recycling facility at Fallin. The work was completed in under two weeks and comprised a fully galvanised steel portal frame structure to BS5950 with Plastisol box profile cladding, Platisol steel box gutters and hand operated roller shutter.
The SPAN is normally the width of the building and is measured to the outside face of the stanchions (or columns or uprights). In a portal framed building it is the distance over which the rafters (or roof beams) reach. It is usually more cost effective in a rectangular building to have the span shorter than the [...]
Many industrial ans commercial buildings these days are designed and manufactured using cold-rolled steel sections. Although lighter in weight than hot rolled sections, the cold rolled steel is very strong (the rolling process actually enhances the strength of the steel) and allows a fully-engineered design of frame with lower foundation loadings. In addition, the sections, together with [...]
Large spans can be attained through the fabrication of heavyweight portals constructed from hot-rolled steel sections and steel plate, fitted with fully galvanised steel purlins and cladding rails in the more traditional format. These tend to be robust structures, being built from standard beams and sections. They are relatively heavy and may require substantial foundations. [...]
In simple terms a portal framed building is series of rigid frames each comprising two uprights and a cross beam, or more commonly two rafter sections forming a pitched roof. Portal framed buildings can be constructed in reinforced concrete, timber or most commonly in steel. They are a cost effective way of providing clear spans [...]
