Cast-iron architecture

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A street in SoHo in New York City showing a number of nineteenth century industrial structures with cast-iron facades.
Cast-iron architecture is a form of architecture where cast iron plays a prominent role. It was a prominent style in the Industrial Revolution era when cast iron was relatively cheap and modern steel had not yet been developed.
Contents
1 Structural use
2 Architectural use
2.1 Catastrophic Failures
3 References
4 External links
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Structural use
Cast iron has been used for centuries, and was used occasionally in architecture in the pre-modern period. It was in eighteenth century Britain that new production methods first allowed cast iron to be produced cheaply enough and in large enough quantities to regularly be used in large building projects. One of the first important projects was The Iron Bridge in Shropshire, a precedent setting structure made almost entirely of cast iron. However, it was grossly over-designed, and the makers (principally Abraham Darby) suffered financially as a result. The quality of the iron used in the bridge is not high, and nearly 80 brittle cracks are visible in the present structure. Later designers and engineers, such as Thomas Telford improved both the design and quality of the material in his bridges (for example, at Buildwas upstream of Coalbrookdale) and aqueducts (such as the world-famous Pontcysyllte Aqueduct in North Wales.)
Architectural use

The highly decorative, Gothic style, cast iron Eglinton Tournament Bridge
In the 1850's the cheapness and availability of cast iron led James Bogardus of New York City to advocate and design buildings using cast iron components. Cast iron could be forged into a wide array of shapes and designs, allowing elaborate facades that were far cheaper than traditional stone carved ones. These facades could also be painted a wide array of colours. Many of these buildings had elaborate neo-classical or Romanesque designs. Mostly used on commercial and industrial buildings there are many surviving examples, especially in the SoHo and Tribeca areas of New York. One of the most intact ensembles in the American West can be seen in the Skidmore/Old Town Historic District, a National Historic Landmark in Portland, Oregon. In Europe the best preserved examples of Victorian cast-iron warehouses can be viewed in Glasgow, Scotland , a city which experienced an enormous expansion in the late 1800s.
Cast iron columns had the advantage of being slender, compared with masonry columns capable of supporting similar weight. Tha saved space in factories and other kinds of buildings, and enable architects of theaters, churches and synagogues to improve sight lines when supporting balconies.
Cast iron also became the standard support structure in the construction of greenhouses, and this type of design led to the monumental Crystal Palace built in London in 1851. Designed by Joseph Paxton, the glass and cast iron structure was much imitated around the world.
In the late nineteenth century modern steel was developed, and it proved far more suitable to cast iron for structural and support purposes. The fashion for forged cast iron facades also faded in this era. Many of the innovations of the cast iron period were carried over to the new steel frame buildings, and were essential to the development of the modern skyscraper.
Catastrophic Failures

Original Tay Bridge from the north

Fallen Tay Bridge from the north
Cast iron has some architectural advantages, and some weaknesses. It is strong in compression (although weak in tension and bending), and its strength and stiffness deteriorate when subjected to the high heat of a fire. In the early era of the industrial revolution it became popular to use cast iron in factory construction, in part owing to the misconception that such structures would be "fireproof." Cast iron was strong enough to support the heavy machinery but was vulnerable to the frequent fires that would occur in such factories. William Strutt pioneered this innovation, building a number of industrial buildings using cast iron supports. However, there were numerous building collapses caused by brittle fracture of large cast iron beams, where the bottom side of the beam was in tension, often from defects such as blow holes within the beams. Internal defects like blowholes were common in large beams. Cast iron was also used widely in bridge construction for the new railway system, sometimes with horrific results, especially when cast iron girders were used instead of arches. The first use was at the Water Street terminus of the Liverpool and Manchester Railway in 1830 to a design by William Fairbairn, a successful design which was demolished about 1900 owing to the widespread concern about cast iron under bridges on the rail network in Britain. To build longer spans,...(and so on)

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