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The material was rarely used for the columns, as the cast was both stronger under compression and cheaper, so a typical iron frame building in the second half of the 19th century had cast iron columns and wrought iron beams. Columns at the Crystal Palace (1851), as well as short trusses, were made from the cast iron, while longer beams used ...
Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
Early gallery designs were inspired by wrought-iron balcony railings, featuring patterns like the cathedral arch and scrollwork. Cast iron posts were used to support the extended galleries. A surviving example can still be observed at 529–531 Governor Nicholls Street. [13] Highly ornate multi-story cast-iron galleries appeared in the 1850s.
Cast iron was also taken up by some architects in the early 19th century where smaller supports or larger spans were required (and where wrought iron was too expensive), notably in the Royal Pavilion in Brighton, designed by John Nash and built between 1816 and 1823, where cast iron columns were used within the walls, as well as cast iron beams ...
A Lally column is a round or square thin-walled structural steel column filled with concrete, [1] and oriented vertically to provide support to beams or timbers stretching over long spans. Lally columns are an engineered component and as such must be installed exactly as the design engineer specified.
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