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The problem of minimum volume design of frameworks to carry alternative loading systems was first studied in [1], but the condition for optimum was found only later in [2]. By following the terminology of [3] for designing with elastic-plastic materials, this condition can be stated as follows. If a structure S can be found which is just at the point of collapse under loading system F) in a deformation mode u\ and which is also at the point of collapse under the loading system F) in a deformation mode u\ such that the virtual work D per unit volume satisfies

Minimum volume design of frameworks and discs for alternative loading systems