A schedule 40, 4-in. pipe is used as column. Some of its properties are: Do = 4.5 in. = 114.30 mm. Di = 4.026 in. = 102.

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A schedule 40, 4-in. pipe is used as column. Some of its properties are:
Do = 4.5 in. = 114.30 mm.
Di = 4.026 in. = 102.26 mm.
I= 7.233 in4 = 3010601.8 mm4
k= 1.509 in. = 38.33 mm.
A= 3.174 in2 = 20.48 cm2
L= 15 ft. = 4.57 m.
Material is AISI C1015, as rolled (E 30x106 psi), and the total load to be carried is 200 kips.
a. What minimum number of columns should be used if a design factor of 2.5 is desired and the
load is evenly distributed among them?
For the approximately fixed ends, use Le=0.65L as recommended by AISC
b. What is the equivalent stress in the column?