Re: Temperature all'interno delle torri e comportamento dell'acciaio in generale

Inviato da  piedone70 il 22/7/2013 6:58:40
Buongiorno a tutti!!

@decalagon

TI DEVO CHIEDERE PER L'ENNESIMA VOLTA DI SMETTERLA DI FARE CHERRY PICKING!! (RUBO L'ESPRESSIONE DA Dr HOUSE, MI PIACE!)

Per chi volesse leggere la questione PER INTERO riporto l'intero testo (una paginetta:

6.4 SUMMARY

Twenty-one exterior panels and four core columns were visually inspected to determine the extent of fire exposure of the various structural elements. From this analysis, the following were concluded:

• The majority of areas examined using the paint cracking technique had “negative” results, indicating that temperatures of the elements did not exceed 250 °C, even though photographic evidence indicated that several locations experienced severe fire exposure, up to 15 min of direct flaming, prior to collapse.

• There were three “positive” findings from the areas analyzed, indicating that mud cracking of the paint occurred. − Panel K-1 (A209: 97-100): Located on the flanges of the crushed portion of column (note: the spandrel directly below this area was “negative”), − Panel K-2 (A236: 92-95): Located on the spandrel just below the floor level (note: spandrel above the floor level and column plates below spandrel were “negative”), − Panel N-8 (A142: 97-100): Located on a seat and its standoff plates, the spandrel was “negative” both above and below floor levels.

• The selected spandrel steels that were identified to have been exposed to severe fire events prior to the collapse of the building did not experience material degradation due to the exposure.

• Results indicated that three of the four seats observed to be exposed to severe pre-collapse fire conditions did not experience significant degradation as a result of the exposure. Results from the seat taken from panel N-8 indicate that this seat may have been exposed to elevated temperatures.


• From the limited number of recovered structural steel elements, no conclusive evidence was found to indicate that pre-collapse fires were severe enough to have a significant effect on the microstructure that would have resulted in weakening of the steel structure.

NIST has documented approximately 3 percent of all perimeter columns and 1 percent of all core columns intersecting floors with pre-collapse fires. Thus, the preceding forensic analysis does not, and cannot, give a picture of temperatures seen by the vast majority of perimeter and core columns.

QUESTO E' QUELLO CHE C'E' SCRITTO PER INTERO IN QUELLA PAGINA: qualcuno vuole che lo traduco?

Decalagon, SEI PREGATO DI INSERIRE ANCHE IL PARAGRAFO CHE C'E' APPENA APPENA SUBITO DOPO QUELLO CHE INDICHI TU!!!

Sai, fa una precisazione non da poco...

E SMETTILA di ripetere sempre quella cosa lì!!

TUTTA LA RELAZIONE DEL NIST, CONTINUA A RIPETERE CHE NON HANNO TROVATO (SALVO QUALCHE CASO) PEZZI DI ACCIAIO CON EVIDENTE LESIONI DA SUPERAMENTO DI 250°. TUTTAVIA INSISTONO SEMPRE SUL FATTO CHE LA LORO ANALISI SI E' BASATA SU UN NUMERO IRRISORIO DI CAMPIONI, CHE NULLA POSSONO DIRE SUL RESTO DELLA STRUTTURA!

ti è chiaro?

a dopo ciao!

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