Abstract
Lifts are the most important of all the mechanical services installed in the high-rize apartment building. The circulation and planning is mainly integrated by the lifts. Therefore, much must be taken into consideration in the planning. As the significant indices of the lift performance, there are listed such as follows; 1. the period of peak 2. the handling capacity 3. the round trip time 4. the unresponced time I surveyed all sorts of vertical traffic movements in many high-rize apartment buildings, three times, almost regurarly in the last ten years (1965-1973), and studied on the lift performance. The results obtained are summarized as follows. 1. The morning peak is by down trip. The evening peak is by both up trip and down. 2. The maximum handling capacity is observed in the evening, about 10% of number of the inhabitants in 15 minutes. 3. The average of the passengers is 2 persons in the direction of up, 1 person in down. 4. The round trip time is about 120 seconds in average. 5. The average of the unresponced time is about 35-40 seconds.
