Question: Problem 4. Columns AB and CD in the figure below have identical rectangular cross sections 50.0 mm by 75.0 mm. The columns are made

Problem 4. Columns AB and CD in the figure below have identical

Problem 4. Columns AB and CD in the figure below have identical rectangular cross sections 50.0 mm by 75.0 mm. The columns are made of a metal that has the stress-strain diagram shown below. Column AB has clamped ends and column CD 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 due to a difference in shortening of the two columns. Determine the load Q that will first cause one of the columns to buckle. 200 mm- 400 mm 50.0 m B A F 1.40 m (a) 50.0 m Stress (MPa) 140 MPa 210 MPa 0 0.002 0.004 Strain (b)

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