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# Osnovne značilnosti »togih« vrvi

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# Fundamental characteristic of »stiff« cables

Synopsis

Thick cables or cables made of rolled or welded profiles, for which the moment of inertia in the cross-section is considerable, we qualify as stiff cables. The application of stiff cables is sometimes convenient because of the large crosssection and the simple joints. However it is necessary to know the influence of the stiffness on the deflection and stresses in such cables and to take it correct into account in the calculation.

The degree of the influence of the stiffness on the deflection of the cable is dependent on a number of factors. For pin hanged cables this influence will be usualy neglectible. But on contrary it is inevitable to consider the stiffness of the cable at the stress calculation.

Te bending moments in stiff cables are directly proportional to the moment of inertia of the cable and reciprocaly proportional to the power which we apply to strain the cable. For economical design it is therefore necessary to determinate the optimum proportion of the cable’s moment of inertia I and the straining power H. At stiff continuous cables the stress state in the field differ not essentialy from the state at pin hanged cables. Near the supports the great bending moments require special constructive arrangements and often the reinforcement of the cross-section. The bending moment above the supports are considerable also at thin flexible cables.