The effect of multiple entrances on the elevator round trip time under up-peak traffic

The design of vertical transportation systems relies on the calculation of the interval as an indicator of the quality of service. This in turn involves the accurate calculation of the round trip time of a single elevator. The calculation of the round trip time is well established for the single entrance scenario (main entrance) but not for the case of multiple entrances.This paper presents two methods for evaluating the effect of the multiple entrances on the value of the round trip time equation. One of the methods is based on the use of a weighted average of the round trip time of all possible scenarios, but it becomes impractical when the number of basements exceeds two. The second method finds the weighted average of the round trip for two specific scenarios: no basements served and basements served and uses the basement equivalent of the highest reversal floor (HB)(HB) and the basement equivalent of the probable number of basement stops (SB)(SB). Verification of the result using a Monte-Carlo simulator is carried out.The formula for calculating the interval as a performance indicator at any of the entrances is also introduced.