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Simulated with completely new developed software designed for structural simulation, this revision of the old WTC 7 simulation attempt serves as validation case for the BCB 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 the documentation of 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: 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. Old simulations from 2014: WTC 1 from 2011: Simulation Stats ---------------- Element count: 28228 Constraint count: 702962 Simulation time: 10 h 1 h building constraints Render time: real-time Model Specs ----------- Group 'Concrete' mass: 100654 t and 93 kg Group 'Steel beams' mass: 22942 t and 844 kg Group 'Steel trusses' mass: 765 t and 292 kg Group 'Facade' mass: 4341 t and 782 kg Group 'Facade roof' mass: 147 t and 608 kg Total mass: 128851 t and 619 kg Credits & Links --------------- Simulation and visualization by Kostack Studio 3D software Blender: Simulated with Bullet Constraints Builder (BCB): Supported by Fracture Modifier build for better performance: Software developed within INACHUS: (Keywords: H2020, InvestEUresearch, EU-funded research, science) at Laurea University of Applied Sciences LUAS, Finland:
