Steels_ Metallurgy and Applications, Third Edition

124 Steels: Metallurgy and Applications

Figure 1.121 Steel-framed housing (Courtesy of Precision Metal Forming Ltd)

(including both sides). According to Haberfield, 191 modular frames, typically
5 m x 2.4 m high, are fabricated at the factory and bolted together on site on
traditional foundations. The internal partitioning walls are constructed and assem-
bled in the same way, followed by the second storey and roof. Steel joists are
used to support the floor loadings from the second floor.
The above author states that up to 2 tonnes of hot dip galvanized steel sections
may be used in a three-bedroomed house and the thickness of the sections ranges
from under 1 mm to 2.5 mm or greater, depending on the function. The basic
frame is designed to withstand all forces and no strengthening or stiffening contri-
bution is assumed from the external brick or internal plasterboard linings.

Steel cladding

From the early days of 'corrugated iron', strip products have featured prominently
as cladding materials, particularly in the construction of industrial buildings. A
considerable amount of effort has been devoted to the development of struc-
turally efficient profiles for steel cladding and some typical profiles are shown in
Figure 1.122.
Although a significant part of the market for cladding and roofing is still
satisfied by unpainted, or zinc- or zinc-aluminium-coated strip, this area has been
revolutionized by the introduction of pre-finished, organic-coated strip. These

Sinusoidal

Trapezoidal symmetrical Trapezoidal asymmetrical

.... Stiffened trapezoidal , ,,

Figure 1.122 Typical profiles of organic-coated steel cladding (After Lewis et al. 192)