Problem 2.12-4A load Pacts on a horizontal beam that is supported by four rods arranged in the symmetrical pattern shown in the figure.Each rod has cross-sectional area Aand the material is elastoplastic with yield stress sY. Determine the plastic load PP.Solution 2.12-4Beam supported by four rodsSECTION 2.12Elastoplastic Analysis173PaaAt the plastic load, all four rods are stressed to theyield stress.F5sY ASum forces in the vertical direction and solve for theload:PP52F12Fsin aPP52sYA(11sin a)PaaPFFProblem 2.12-5
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