it collapsed because the lower floors were on fire for 8 hours. 8 hours of fire tends to weaken steel weakend steel cannot support a 50 odd story building surprisingly enough
Even buildings built over 100 years ago that got bombed in the 2nd world war didn`t collapse into themselves... They burn until there is no longer any fuel leaving a shell with no floors....... Stick to Gambling Trev you are out of your depth here mate
everyone in my family are civil engineers, both sides, even my gran is a civil engineer, i have talked to them all.
yeah it must of been a controlled demolition. nobody noticed the weeks of work that went into the placing of explosives in the steel columns (which would not have been exposed btw) or the miles of wiring that is needed to carry out such an explosion or the actual noise of any explosion what so ever. Hhmmmm good one PS 100 year old buildings werent steel frame you mutant