Wire Rope Design Safety Factor
Unirope synthetic slings are manufactured to ensure a design factor of at least 5 1.
Wire rope design safety factor. A design factor of 10 is usually chosen when wire rope is used to carry personnel. A factors of safety for wire ropes. Operating loads not to exceed 20 of catalog breaking strength operating loads may have to be reduced when life limb or valuable property are at risk or other than new rope is used. Factors of safety for suspension wire ropes and design of wire rope fastenings for power elevators.
S manufacturer s rated breaking strength of one rope. Wll and design factor. Factors of safety fos are a part of engineering design and can for structural engineering typically be expressed as fos f fail f allow 1. Rope strength design factors.
1 the factor of safety for wire ropes shall be calculated by the following formula. The rope strength design factor is the ratio of the rated strength of the rope to its operating stress. Due to buckling the failure load of a steel column in a building is estimated to 10000 n. A design factor of 5 is chosen most frequently for wire rope.
If a particular rope has a rated strength of 100 000 lbs. F allow allowable load n lb f. Example structural steel column in a building. S x n f w where.
Wire rope is not termed oversize until its diameter exceeds the allowable maximum. F fail failure load n lb f. For example a 1 nominal diameter wire rope may vary between 1 and 1 05 in diameter. Fos factor of safety.