Re: Temperature all'interno delle torri e comportamento dell'acciaio in generale
Inviato da Cleaner il 28/7/2013 17:28:01
Citazione:
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It is known that structural steel begins to soften around 425°C and loses about half of its strength at 650°C.4 This is why steel is stress relieved in this temperature range. But even a 50% loss of strength is still insufficient, by itself, to explain the WTC collapse. It was noted above that the wind load controlled the design allowables. The WTC, on this low-wind day, was likely not stressed more than a third of the design allowable, which is roughly one-fifth of the yield strength of the steel. Even with its strength halved, the steel could still support two to three times the stresses imposed by a 650°C fire.
piedone70 ha scritto:
@dr house
infatti... hai postato una cosa che IN EFFETTI NON DICE PROPRIO "TANTO"...
Thus, the fact that there were 90,000 L of jet fuel on a few floors of the WTC does not mean that this was an unusually hot fire. The temperature of the fire at the WTC was not unusual, and it was most definitely not capable of melting steel.
LO RIPRENDO GIUSTO PER EVIDENZIARE:
CONSEGUENTEMENTE, IL FATTO CHE CI FOSSERO 90K LITRI DI CHEROSENE AVIO SUI PIANI DEL WTC NON IMPLICA CHE CI FOSSE UN FUOCO DI UN CALORE INUSUALE!
e infatti è dal mio post #45 a pag 2 che dico:
VEDASI CURVA ISO 834, IN PRESENZA DI IDROCARBURI IL CALORE E' LO STESSO 1100°, PERO' SI RAGGIUNGE MOLTO PIU' VELOCEMENTE!!
LE TEMPERATURE DEL FUOCO AL WTC NON ERANO FUORI DALLA NORMA (APPUNTO!) E NON ERANO IN GRADO DI SCIOGLIERE L'ACCIAIO.
INFATTI, SERVONO OLTRE 1500° PER FARE QUELLO, NON SI DICE CHE L'ACCIAIO SI E' FUSO, HA "SOLO" RAGGIUNTO E SUPERATO LA SUA TEMPERATURA CRITICA, CHE E' DI SOLI 500°
ciao!
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It is known that structural steel begins to soften around 425°C and loses about half of its strength at 650°C.4 This is why steel is stress relieved in this temperature range. But even a 50% loss of strength is still insufficient, by itself, to explain the WTC collapse. It was noted above that the wind load controlled the design allowables. The WTC, on this low-wind day, was likely not stressed more than a third of the design allowable, which is roughly one-fifth of the yield strength of the steel. Even with its strength halved, the steel could still support two to three times the stresses imposed by a 650°C fire.
Messaggio orinale: https://old.luogocomune.net/site/newbb/viewtopic.php?forum=4&topic_id=7462&post_id=239031