________________________________________________________________________
PROBLEM (11.66) Redo Prob. 11.65, assuming that the column is pinned at one end and
fixed at the other.
SOLUTION
0.7 420
e
LL m== ,m 0.42 ( 2 3) 1.455
e
Lr a a==
Assume: 9.5 Equation (13.21): 66.
e
Lr<<
36
2
250 10 1.455
[140 0.87( )]10
all aa
σ
×
==−
or
23
9.04 10 1.786 10 0aa
−−
−× − ×=
3
m= Solving: am So, 47.02 .
2 3 13.57ra mm==
420 13.57 30.95 66
e
Lr==<
m
Our assumption was correct. Use am47
=
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