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## Fig. 22-2 This modern high-rise suffered total catastrophic collapse after approximately 5½ hours of fire exposure. There have been other high-rise office building fires where the fire totally consumed all of the combustibles on the fire floor but didn't cause total collapse, or for that matte...

## Fig. 22-2 This modern high-rise suffered total catastrophic collapse after approximately 5½ hours of fire exposure. There have been other high-rise office building fires where the fire totally consumed all of the combustibles on the fire floor but didn't cause total collapse, or for that matter, in some cases did not even spread from floor to floor. As described in chapter 18, however, this is only true of heavyweight buildings. In addition to the three World Trade Center building collapses and the Plasco Building in Tehran, Iran (2017), the fire at One