PE Problem #51

8/13/2018

An equivalency is being developed for a building with unprotected steel W24x76 columns. Determine the fire endurance time (in minutes) for one of these columns W24x76 columns have an approximate flange and web thickness of 0.68 inches, and a flange width of 8.99 inches.
a. 4.3 minutes
b. 7.8 minutes
c. 9.7 minutes
d. 55.3 minutes

Solution | Posted 08/14/18

4 Comments

8/13/2018 09:31:49 am

Answer: C

Source: FPH pg. 19.47

8/13/2018 09:59:15 am

Eqn 2, p 19-47

Colleen

8/13/2018 11:13:45 am

C. 9.7 min.

D=4a+2b-2c=4(8.99)+2(24)-2(0.68)=82.6
M/D<10, so per FPH 19-47,

R=10.3(M/D)^0.7=10.3*(76/82.6)^0.7=9.72 min.

David

8/13/2018 11:55:43 am

c.
Table 53.3 SFPE 5th.

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