http://en.wikipedia.org/wiki/Great_Beijing_Mandarin_Oriental_Hotel_fire_of_February,_2009 Can anyone explain to me why didn't this building collapse on itself after burning for 5 hours? I thought the steel would have weakened enough to allow some kind of total or partial collapse. This building was still under construction and had no working sprinkler system. The Chinese engineers that designed and built this thing are amazing! What kind of materials did they use? I always believed fire brought down large structures. Sorry if this was discussed before. I was searching through your forums and didn't find any mention of it.