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STAAD Commands and Input Instructions
Section 5
5-98
5.20.9 Applying Fireproofing on members
STAAD.Pro now includes a method to automatically consider the
weight of fireproofing material applied to structural steel.
Two types of fireproofing configurations are currently supported.
They are:
Block Fireproofing (BFP):
The next figure shows this configuration. The fire-protection
material forms a rectangular block around the steel section.
The area of fireproofing material (A
fp
) at any section along the
member length is calculated in the following manner.
For Wide Flanges (I-shaped sections), Channels and Tees,
A
fp
= [(B
f
+ 2T)*(D+2T)] - A
steel
For single angles, A
fp
= [(B
f
+ 2T)*(D+2T)] - A
steel
B
f
is the flange width
D the overall depth of the steel section
T is the thickness of the fireproofing material beyond the outer
edges of the cross section as shown in the next figure.
A
steel
= Area of the steel section