Optimum Plastic Design of a Portal Frame for Alternative Loads

[+] Author and Article Information
W. Prager

Department of the Aerospace and Mechanical Engineering Sciences, University of California at San Diego, La Jolla, Calif.

J. Appl. Mech 34(3), 772-773 (Sep 01, 1967) (2 pages) doi:10.1115/1.3607781 History: Received November 04, 1966; Online September 14, 2011


Minimum-weight design of a portal frame for alternative combinations of horizontal and vertical loads is discussed. It is shown that the usual proof of the existence of a Foulkes mechanism as a necessary condition for minimum weight cannot be carried over to this problem.

Copyright © 1967 by ASME
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