Geodesic
Minimum weight design of statically indeterminate beams with normal stress constraint
Theoretical and applied mechanics, Tome 25 (1999) no. 1, p. 107 .

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An optimization problem of linear elastic statically indeterminate beams is discussed. The cross-section of the beam is variable and determined for the equal stress criterion. The problem is solved with the aid of Castiglianos second theorem. Some optimization conditions are deduced. A few illustrating examples are given. 
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     title = {Minimum weight design of statically indeterminate beams with normal stress constraint},
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D. Radomirović; О. Zamurović; J. Conić; Z. Jandrić. Minimum weight design of statically indeterminate beams with normal stress constraint. Theoretical and applied mechanics, Tome 25 (1999) no. 1, p. 107 . http://geodesic.mathdoc.fr/item/TAM_1999_25_1_a6/