One of the stairways had steps 142 centimetres wide, but the other two measured just 112cm, which would not be permitted by today’s skyscraper building codes.Īs a result of the twin towers’ system of “ sky lobbies”, which was innovative for its time, the number of available elevators varied depending on the floor. Each tower had three staircases which, barring a few twists and turns, ran all the way from the top of the building down to the mezzanine level just above the ground floor. The 110-storey twin towers, constructed from 1966 to 1973, both had open-plan floor designs, with stairs and elevators located in the buildings’ core. The twin towers’ elevator layouts meant getting to ground level was more complicated on some floors than on others. RMIT University provides funding as a strategic partner of The Conversation AU. Finally, Erica gratefully acknowledges the UK WTC project HEED, funded by the UK EPSRC (grant EP/D507790/1) for providing access to the HEED database, which was used in her PhD thesis. While at NIST, Erica worked on NIST's Technical Investigation of the 2001 WTC Disaster as a team member of Project 7: Occupant Behavior, Egress, and Emergency Communications. Also, from 2002 to 2020, Erica worked as a research engineer and social scientist in the Engineering Laboratory of the National Institute of Standards and Technology. She is affiliated with the Society of Fire Protection Engineers (SFPE) as a Section Editor for their Handbook of Fire Protection Engineering (Human Behaviour Section) and as a member of the Board of Governors for the SFPE Foundation. Vice-Chancellor's Senior Research Fellow, RMIT UniversityĮrica Kuligowski currently receives funding from the National Institute of Standards and Technology's (NIST) Measurement Science and Engineering Grants Program (as a subcontractor).
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