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Lessons from the evacuation of the world trade centre, 9/11 2001 for the development of computer-based simulations

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Abstract

This paper reviews the state-of-the-art in evacuation simulations. These interactive computer based tools have been developed to help the owners and designers of large public buildings to assess the risks that occupants might face during emergency egress. The development of the Glasgow Evacuation Simulator is used to illustrate the existing generation of tools. This system uses Monte Carlo techniques to control individual and group movements during an evacuation. The end-user can interactively open and block emergency exits at any point. It is also possible to alter the priorities that individuals associate with particular exit routes. A final benefit is that the tool can derive evacuation simulations directly from existing architects, models; this reduces the cost of simulations and creates a more prominent role for these tools in the iterative development of large-scale public buildings. Empirical studies have been used to validate the GES system as a tool to support evacuation training. The development of these tools has been informed by numerous human factors studies and by recent accident investigations. For example the 2003 fire in the Station nightclub in Rhode Island illustrated the way in which most building occupants retrace their steps to an entrance even when there are alternate fire exits. The second half of the paper uses this introduction to criticise the existing state-of-the-art in evacuation simulations. These criticisms are based on a detailed study of the recent findings from the 9/11 Commission (2004). Ten different lessons are identified. Some relate to the need to better understand the role of building management and security systems in controlling egress from public buildings. Others relate to the human factors involved in coordinating distributed groups of emergency personnel who may be physically exhausted by the demands of an evacuation. Arguably, the most important findings centre on the need to model the ingress and egress of emergency personnel from these structures. The previous focus of nearly all-existing simulation tools has been on the evacuation of building occupants rather than on the safety of first responders.

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Abbreviations

AMCBOUS:

Association of Major City/County Building Officials

EC:

European Commission

ESU:

NYPD Emergency Service Unit

FAA:

US Federal Aviation Administration

FDNY:

Fire Department of New York

FRS:

UK Fire Research Service

GES:

Glasgow Evacuation Simulator

IBC:

International Building Code

NCSBCS:

US National Conference on Building Codes and Standards

NFPA:

US National Fire Protection Association

NIST:

US National Institute of Standards and Technology

NYPD:

New York Police Department

OSHA:

US Occupational Safety and Health Administration

PAPD:

New York Port Authority Police Department

PATH:

New York Port Authority Trans-Hudson (metro link)

TCPP:

Transport Canada Personality Profile

WTC:

World Trade Centre

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Acknowledgements

I would like to thank the other members of the Department of Computing Science, University of Glasgow for their support. Thanks are due to Dr James Hill, Building and Fire Research Laboratory, US National Institute of Standards and Technology for providing valuable encouragement during the initial stages of this work.

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Correspondence to C.W. Johnson.

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Thanks are due to J. Appleby, P. Cooper, A. Foss, S. Hailey and B. Jenks who were responsible for the design and implementation of the GES application. They also drove the development of the Boyd Orr evacuation scenarios that are used to illustrate the opening sections of this paper.

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Johnson, C. Lessons from the evacuation of the world trade centre, 9/11 2001 for the development of computer-based simulations. Cogn Tech Work 7, 214–240 (2005). https://doi.org/10.1007/s10111-005-0009-5

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