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Even high slender structures of beam type, like masts, do not always deflect in the same plane as the loading acts. The nonsymmetry of the cross-section or imperfections of the material evoke a combined response in space. Torsion can occur too: it can be coupled with the bending through the guy supports, if the forces in windward and leeward guys of the support are different. Torsional vibrations...
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