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Design of any structure for minimum weight is essentially based on the determination of optimum proportions on the basis of simultaneous failure in all the critical modes. The critical modes for a thin-walled beam subjected to bending loads would be due to yielding of the extreme fibre in tension or compression and local buckling of the compression flange. S. Krishnan and K. V. Shetty
The behaviour of a structural member subjected to a torsional load may be defined by its torsional rigidity and the stress distribution over its cross section. As distinct from the solid or hollow cross section which is homogeneous in the axial direction, the semi-closed box section represents a three-dimensioned problem of a complex nature. This Paper attempts a solution by the Strain Energy method leading to expressions of torsional rigidity of a particular type of design and also analyses the stress distribution, the results being expressed in terms of the applied torque. F. Laszlo, Dr. Ing and and H. Nolle
Structural analysis devolves upon two essential operations: the assessment of the external forces to which a structure may be subjected, and the determination of the internal stresses induced by these forces in the various portions of a structure. Walter A. Woeber