Abstract
The paper treats optimal design of a plane elastic truss (Fig. 1) subject to two alternative loads L′ and L″, when an upper bound is given for the absolute value of the stress in any bar. While the load L′ is fixed, the load L″ is varied subject to the restriction to nonnegative values of P and Q (Fig. 1). The possibility that the optimal truss, that is the truss with the smallest total volume of bars, is statically determinate is not excluded. Statically indeterminate trusses, and particularly fully stressed trusses of this kind are found to play a less important role than has generally been believed.
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