Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
Elevators are essential for means of vertical transportation. In recent year, elevators to be installed in high-rise buildings are long stroke, thus the elevator ropes are longer. High-rise buildings have longer natural period than conventional buildings. As elevator ropes become longer, the natural period of the elevator ropes become longer as well, and get closer to the natural period of the building. Consequently, the elevator ropes collide against hoistway when the elevator ropes vibrate by an external force, such as a strong wind and earthquake. Secondary damage such as containment of passengers and elevator service stop may occur. Therefore, in this research, we aim to design elevator that can be operated even after the earthquakes. In this report, we examined effectiveness of elevators using intermediate transfer floors for damage reduction of ropes. In the analysis, the collision load of the main rope of car side was examined when the lift stroke is divided two. The calculated results of the analysis confirmed that dividing the lift stroke reduces the maximum collision load of the main rope of car side .In the probabilistic risk assessment, we examined the probability of damaging of rope using the fragility curve. From the fragility curve, it was confirmed that dividing the lift stroke reduced the probability of damage of rope. Therefore, dividing the lift stroke is effective for reducing damaging of rope.
