Abstract
This paper examines the problem of assigning economical sections to frames which derive their strength from a bending action. The theory of plastic collapse is used to determine the strength of a design, and a virtual work approach is used to derive the equations governing the problem. These equations show that a linear function whose variables are constrained by linear inequalities has to be minimized. In order to illustrate the meaning of these equations a geometrical analogue is described and this analogue is then used to prove a few general theorems. The paper concludes with a demonstration of the way in which these theorems can be applied to the design of a simple practical structure.
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More From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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