Problem 2.12-9The structure shown in the figure consists of ahorizontal rigid bar ABCDsupported by two steel wires, one of length Land the other of length 3L/4. Both wires have cross-sectional area Aand are made of elastoplastic material with yield stress Yand modulusof elasticity E. A vertical load Pacts at end Dof the bar. (a)Determine the yield load PYand the corresponding yielddisplacement Yat point D. (b)Determine the plastic load PPand the corresponding displacementPat point Dwhen the load just reaches the value PP. (c)Draw a load-displacement diagram with the load Pas ordinate andthe displacement Dof point Das abscissa.Solution 2.12-8Rigid bar supported by wires176
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