Structural steel loses 70% of its room-temperature strength at a temperature of 600 C (1,112 F). (It gains about 35% in strength by a temperature of 225 C / 437 F, but slides downhill from there.) I don't have knowledge of other examples, except to note that the same dynamic undoubtedly happened with the Twin Towers. It is a question of whether a fire can proceed to attain such temperatures. As I understand from a past reading of the WTC7 event, the fire fighting systems were initially disabled by shock.
Structural steel loses 70% of its room-temperature strength at a temperature of 600 C (1,112 F). (It gains about 35% in strength by a temperature of 225 C / 437 F, but slides downhill from there.) I don't have knowledge of other examples, except to note that the same dynamic undoubtedly happened with the Twin Towers. It is a question of whether a fire can proceed to attain such temperatures. As I understand from a past reading of the WTC7 event, the fire fighting systems were initially disabled by shock.
https://www.engineeringtoolbox.com/metal-temperature-strength-d_1353.html
Shock of what?
Somehow, I can't get back to the original thread and have lost the stream of consciousness. I don't know how to answer.