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 [...]
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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 [...]
