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How did steel and cast iron make taller and lighter buildings possible in the 19th century?
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Architecture
The Great Court, designed by Foster and Partners, 2000; in the British Museum, London.
In the 19th century, the transition from traditional materials like stone, brick, and wood to cast iron and steel revolutionized architecture. These metals allowed for significantly stronger, taller, and lighter structures by enabling the creation of skeletal frames that could bear heavy loads more efficiently than masonry.12
Structural Advantages
- Load-Bearing Capacity: Cast iron was the first metal to replace traditional materials, serving as columns and arches. However, because it performed better under compression than tension, it was largely superseded in the late 19th century by steel.1
- Steelās Versatility: Steel is more elastic, workable, and uniformly strong. Its ability to resist stress in all directions allowed engineers to calculate structural requirements closely, leading to the development of rigid, continuous frames using I-beams and U-shaped channels joined by bolts or rivets.13
- Skeletal Construction: This shift allowed the building's frameārather than its wallsāto support the structure's weight. By the 1890s, this technology matured into the steel-frame high-rise, where the metal skeleton carried the load, enabling buildings to reach unprecedented heights.32