Columns AB and CD in Figure P12.37a have identical rectangular cross sections of 50.0 mm b...

Columns AB and CD in Figure P12.37a have identical rectangular cross sections of 50.0 mm by 75.0 mm. The columns are made of a metal that has the stress-strain diagram shown in Figure P12.37b. Column AB has clamped ends and column CD has pinned ends. Assume that member F is rigid and weightless and that it is prevented from moving laterally. Also, neglect the rotation of member F caused by a difference in shortening of the two columns. Determine the load Q that will first cause one of the columns to buckle.

FIGURE P12.37a

FIGURE P12.37b