@Sacha
Sacha 02.07.2022 : Une colonne
a rompu, dans son prolongement le
penthouse s’affaisse, l’effondrement
est alors interne, puis la façade externe nord tombe en 6,5 secondes.
Votre méthode a le
mérite de démontrer que VOTRE EXPERTISE en
résistance des matériaux, calcul des structures et génie civil est NULLE !
Je vous suggère de vous concentrer sur les sujets que vous
maîtrisez, comme le trafiquage de messages officiels.
In summary, several findings were made from the
analyses above :
1. Columns 79, 80, and 81 did not fail at the
lower floors of the building. Instead, they needed to have failed at the upper
floors of the building all the way to the penthouse. Yet there were no
documented fires above Floor 30. Therefore, fire did not cause the collapse of Columns 79, 80, and 81 nor the
collapse of the east penthouse.
2. The hypothetical failure of Columns 79, 80,
and 81 — the three easternmost core columns — would not trigger a horizontal progression of core column failures.
Therefore, the hypotheses of NIST,
Arup/Nordenson, and Weidlinger that the buckling of Column 79 would trigger a
progressive collapse of the entire building are invalid, and the
collapse of Columns 79, 80, and 81 high in the building was a separate and
distinct event.
3. Even if we assume the failure of Columns 79,
80, and 81 could lead to the failure of the next row of core columns, the
hypothetical failure of Columns 76 to 81 would overload the exterior columns
around the southeast corner of the building, rather than overloading the next
row of core columns to the west, which would result in the building tipping to the southeast and not in a
straight-down collapse.
4. The
simultaneous failure of all core columns over 8 stories followed 1.3 seconds
later by the simultaneous failure of all exterior columns over 8 stories
produces almost exactly the behavior observed in videos of the collapse.
The collapse could have started at various floors starting at Floor 16 and
below and produced the same behavior.
It is our conclusion that the collapse of WTC 7 was a global failure involving the near simultaneous
failure of all columns in the building and not a progressive collapse
involving the sequential failure of columns throughout the building.
Despite simulating a number of hypothetical
scenarios, we were unable to identify any progressive sequence of failures that
could have taken place on September 11, 2001, and caused a total collapse of
the building, let alone the observed straight-down collapse with approximately 2.5
seconds of free fall and minimal differential movement of the exterior.
A Structural Reevaluation of the Collapse of
World Trade Center 7
University
of Alaska, Fairbanks, Mars 2020