May 31, 2015
Architects and Engineers for 911/Truth

NIST’s official “normal office fire” explanation for the collapse of World Trade Center Building 7 does not explain the 47-story tower’s stunning implosion and free-fall acceleration. That’s because NIST has ignored the data that does explain these extraordinary features — the evidence of controlled demolition.

PART 5: How Skyscrapers Are Really Imploded

By Simon Falkner and Chris Sarns

Editor’s Note: This fascinating and provocative technical article on NIST’s mistreatment of the World Trade Center Building 7 evidence is broken down into a series of six articles. The sixth and final installment, below, is PART 5: How Skyscrapers Are Really Imploded. The first installment was the INTRODUCTION. The second installment was PART 1: NIST and Popular Mechanics Fabricate Myth About WTC 7’s “Scooped-Out” 10 Stories. The third installment was PART 2: NIST’s Fictitious Gouge Launches Design Flaw Myth and Collapse Initiation Theory. The fourth installment was PART 3: Trusses & Tanks—Popular Mechanics Helps NIST Create More Myths. The fifth installment was PART 4: Independent Analysis Disproves NIST’s New Thermal Expansion Hypothesis.

In PART 4, we demonstrated that NIST’s hypothetical girder walk-off event contradicted its own data, and therefore that NIST’s column #79 buckling scenario could not have happened. Thus, we proved that NIST had no evidence upon which to base its claim of how the collapse of WTC 7 was triggered.

Now let us ask: Did NIST’s explanation of how this initiating event led to the observed collapse of the entire building also contradict its own data? The short answer: “Yes.”

For a more detailed answer, we must first assume, for the sake of argument, that column #79 buckled and that this event did lead to NIST’s hypothesis for how the complete collapse of WTC 7 occurred. NIST presumed that a localized collapse of the northeast section of the building set off a progressive collapse of the core, and that this 7.6-second core collapse sequence (see NIST’s time line) occurred while the building’s exterior remained undistorted. Specifically, NIST claimed that the buckling of core column #79 led to the subsequent buckling of columns 80 and 81, then to the collapse of the east penthouse, and finally to the failure of the entire core (see Figure 19).

NIST’s presumption leaves us with this obvious question: Did the hypothetical progressive core collapse match the distinguishing features of the observed implosion of WTC 7?

The answer is a resounding “No,” according to more than 2,350 architects and engineers and hundreds of other building professionals and physical scientists who belong to AE911Truth. In their expert eyes, NIST’s computer simulation proved that WTC 7 most certainly did not collapse according to NIST’s hypothetical progressive collapse scenario.

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