An impressive project for one individual, Kostock's simulation is an amazing static model of WTC7, and gives a reasonable facsimile of the collapse, given the limitations of what he is doing.
Published on Sep 11, 2017
Simulated with completely new developed software designed for structural simulation, this revision of my earlier WTC7 simulation attempt serves as validation case for the software.
New in this simulation compared to the old one:
- Multiple constraints per connection are used to represent individual degrees of freedom (DOF)
- Breaking thresholds are computed from real world parameters
- Correct steel thicknesses and beam dimensions are used
- Plastic deformation is now simulated
While this simulation of World Trade Center 7 is still not 'perfect' it resembles much better the specific characteristics observed in reality than the older model. This simulation confirms mostly the findings of NIST, it is safe to say that the columns 79 to 81 were the first columns which gave way because the removal of other columns led to much different collapses. More than that is hardly determinable, such a system behaves just to chaotic to tell what exact connection failed first. In this regard NIST might be wrong by declaring a specific failure point. However, I consider this not being an important question given the fact how compromised the structure around these three columns must have been exposed to fire for hours, a situation beyond any imaginable safety design specification.
Having said that, I want to emphasize that this video is not intended to prove or disprove 9/11 conspiracy theories. I'm deleting comments that include hate speech, so you better think twice before starting an argument about the reasons of 9/11 here. Instead, I recommend to read a neutral source like: https://en.wikipedia.org/wiki/9/11_co... to get some pros and cons instead of watching YouTube videos.
This is a private project. There are no third parties involved. There is no scientific report available. No peer review has taken place. Thanks for watching.
People will surely pounce on the fact that the outer skin does not behave the same as the real event.
But as with the NIST simulation, this demonstrates an interior collapse followed by the exterior bucking and falling.
Overall a very impressive effort.
It also provides some new viewpoints, that might be helpful perspective.