要素試験によるエレベータロープの振動特性に関する基礎的研究

（ロープの構成・心綱が減衰比に及ぼす影響について）

抄録

Elevators are essential for means of a vertical transportation. Recently, high-rise buildings are increasing. Those elevator ropes become longer. As a result, the natural period of the elevator rope becomes closer to the natural period of the high-rise building. The risk of resonance increases. When the high-rise buildings receive an external force such as the strong wind and the earthquake, the elevator rope may sway intensely. Furthermore the rope may hook to the equipment in the hoistway. To prevent such damage, it is necessary to comprehend the vibration characteristics of each rope type. In this study, free vibration tests are carried out using an elemental test equipment, furthermore we investigate the relationship between various factors and damping ratios. Based on the results, we will develop a method for estimating ropes with higher damping ratios. Furthermore, we will plan the improvement of the response analysis by grasping vibration behavior of ropes. In this paper, free vibration tests were conducted with ropes of different rope configurations (number of strands) and rope cores (with or without resin coating). As a result, the damping ratio increased with the increase of strands number. The damping ratio with resin coating was highter than that without resin coating.