Civil Engineering Reference
In-Depth Information
Highly
effected
by fire
FIGURE 7.14
Deck categories based on the effects of fire.
High
effect on
frame due to
fire
FIGURE 7.15
The main frame categories exposed to fire.
increases rapidly after 400
°
C; by 550
°
C, steel retains about 60% of its room-
temperature yield strength.
An often quoted general rule for fire-affected hot-rolled structural steels is
that, if the steel is straight and there are no obvious distortions, then the steel
is fit for use. At 600
C, the yield strength of steel is equal to about 40% of
its room-temperature value; it follows therefore that any steel still remaining
°
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