A 1-in.-square aluminum strut is maintained in the position shown by a pin support at A and by sets of rollers at B and C that prevent rotation of the strut in the plane of the figure. Knowing that LAB = 3 ft, LBC = 4 ft, and LCD = 1 ft, determine the allowable load P using a factor of safety with respect to buckling of 3.2. Consider only buckling in the plane of the figure and use E = 10.4 × 106 psi.
Fig. P16.19

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