8-14. A 26-ft
column consists of four steel angles laced together. The cross-section is shown
in the figure. The column is pin connected at both ends. Each of these angles
has an area of
, and moments of inertia of
. If an axial load 
is
applied to the column, and the modulus of elasticity follows 
, determine the distribution of the critical
axial buckling load. Also, determine the probability of buckling. Assume that E
and P are independent.
(Ans. 
, 
)
