The mechanical characteristics of suspension ropes used in traction sheave lifts are required to comply with ever more stringent mechanical requirements, due partly to the height of modern buildings and consequent increases in the required vertical rise. An important aspect here is rope elongation under load, and consequently the spring rate of the elevator car during operation and during loading and unloading. In order to describe these spring rates, the rope elongation module must be known relative to safety factors typical for the elevator in question. This is particularly significant, given that the rope stress-elongation curve is non-linear in shape and the rope elongation module is not constant.
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