Computer Study—comparison of cantilever and portal methods with an exact analysis.
(a) Deter-mine the moments, shear, and axial forces in the members of the frame in Figure
P13.18, using the portal method. (b) Repeat the analysis using the cantilever method.
Assume the area of the interior columns is twice the area of the exterior columns. (c)
Compare the results with an exact analysis using a computer software. Use E = 29,000
kips/in. 2 for all members; A = 12 in. 2 and
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