A pinned-end strut of length L = 5.2 ft is is constructed of steel pipe (E = 30 ( 103 ksi) having inside diameter d1 = 2.0 in. and outside diameter d2 = 2.2 in. (see figure). A compressive load P = 2.0 k is applied with eccentricity e = 1.0 in.
(a) What is the maximum compressive stress (max in the strut?
(b) What is the allowable load Pallow if a factor of safety n = 2 with respect to yielding is required? (Assume that the yield stress (Y of the steel is 42 ksi.)