Steel is a noncombustible material. So why do steel components in buildings, such as W-section beams, steel joists, and joist girders, need protection against fire?
What will be an ideal response?
Two reasons: (i) Steel has a high coefficient of thermal expansion. Under high temperature, a steel member would expand substantially and push the members to which it is connected, causing failure. (ii) Steel becomes soft on heating. This reduces its strength and modulus of elasticity.
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