Fire resistance issues in the collapse of the WTC towers

The twin towers of the World Trade Centre suffered significant damage from the impact of the planes, however, they withstood the impact. The severe fires that followed the impact brought down the twin towers, WTC 2 and WTC 1, at different intervals - 59 and 89 minutes respectively following the impact. Thus, fire issues played a major part in the collapse of the twin towers and the role of the various fire resistance issues is examined in this paper. The intense fires ignited by jet fuel, loss of fire defence mechanism, damaged fire proofing and the stressed state of the structural system were some of the key factors that contributed to the collapse of the towers.L?impact des deux avions qui ont attaqu\ue9 les tours jumelles du World Trade Centre a caus\ue9 des dommages consid\ue9rables mais non en soi fatals pour les structures. Ce sont les graves incendies qui en ont r\ue9sult\ue9 qui ont caus\ue9 l?effondrement des tours WTC 2 et WTC 1, \ue0 des intervalles diff\ue9rents, soit 59 minutes et 89 minutes respectivement apr\ue8s l?impact. Ainsi, les incendies ont jou\ue9 un r\uf4le majeur dans l?effondrement des tours jumelles. Dans ce document, on examine l?importance des diverses questions li\ue9es \ue0 la r\ue9sistance aux incendies qui sont en jeu ici. Les incendies intenses qui ont \ue9t\ue9 d\ue9clench\ue9s par le carbur\ue9acteur, les pertes au niveau des m\ue9canismes de d\ue9fense-incendie, l?endommagement des syst\ue8mes d?ignifugation et la mise \ue0 dure \ue9preuve de la strat\ue9gie structurale comptent parmi les facteurs cl\ue9s qui ont tous contribu\ue9 \ue0 l?effondrement des tours.Peer reviewed: YesNRC publication: Ye