Stairwell Evacuation from Buildings: What We Know We Don’t Know

Abstract

Occupant descent down stairwells during building evacuations is typ- ically described by measurable engineering variables such as stairwell geometry, speed, density, and pre-evacuation delay. In turn, predictive models of building evac- uation use these variables to predict the performance of egress systems for building design, emergency planning, or event reconstruction. This paper provides a sum- mary of literature values for movement speeds and compares these to several new fire drill evacuations. Movement speeds in the current study are observed to be quite similar to the range of literature values. Perhaps most importantly though, the typ- ical engineering parameters are seen to explain only a small fraction of the observed variance in occupant movement speeds. This suggests that traditional measures form an incomplete theory of people movement in stairs. Additional research to better understand the physiological and behavioral aspects of the evacuation process and the difference between fire drill evacuations and real fire emergencies are needed.