This had the effect of forcing all the thermal movement of the beams to move to the west, maximizing the displacement of the girder pushed by the beams relative to its seat at column The UAF study, on the other hand, found that the east wall of the building moved almost 6 inches to the east under the thermal effects of the fire, and as a result the girder had only about an inch of movement relative to the column, contradicting the NIST collapse initiation event claim.
We welcome and encourage an open and honest dialogue regarding this event, in the name of upholding the integrity of our profession. Roland Angle, P. Statements made in this article are consistent with video evidence of the collapse of WTC 7.
Video showed that the building was undoubtably taken down by a flawless controlled demolition. The fact that this is the only news story on this shows just how bought and paid for the entire field of mainstream news is.
Anyone watching a video of building 7 falling, at free fall speed for a large chunk of it, mind you… can see that it was a controlled demolition. I head that WTC7 was the control centre for all the buildings to come down, and this is why it was destroyed last of all. This is some of the questioning directed to the NIST investigators and their responses following their release of their draft Final Report in August Many thanks to DCN for publishing this article.
I only wish American MSM has such integrity. After this study, that other evidence must be viewed in a new light. The entire interior of the steel structure was covered with asbestos. The steel was E81 and the structure support was from a mesh from the combination of structural steel from the elevator shafts, floor trusses to the steel enforced concrete on the outer structure which all went up in a pyroclastic flow of pulverized concrete, everything inside the structure and nothing was found bigger that a soccer ball that would be found in a collapse and the power was such that ejecting several hundred thousand tons of large portions of the structure was over several hundred feet.
Watching this situation unfold is one more example of how corrupt our government is. Here is a group of Architects and Engineers with scientific fact providing the buildings could not have fallen the way NIST hypothesis said it did, and it was a theory.
If then. But let me run a red light and see what happens to me. I totally agree that this should be based on evidence, not some hair-brained theory. Hearty congratulations are due the Daily Commercial News for this fine article describing problems with the official explanation of the collapse of World Trade Center Building 7.
I have long been aware of these concerns with the NIST report and applaud your publication here for the accuracy, pertinence, and concision of the article.
I hope this will indeed aid in disseminating the truth about Building 7 and the other buildings of the World Trade Center complex on that fateful day in September Baby steps. And worse, once you tell them they ask if I really thought we went to the moon. They are oh so well indoctrinated. Heads will not roll … but they should. Smaller groups will still have corruption … but never on this scale. And there is always that remote chance that one of the splintered groups will be corruption free.
The legal document, including all the exhibits of evidence, can be read on their website. So sad that it could take nearly 20 years for some of the more courageous media to ask questions about this. I do not believe in conspiracies. It must have been 18 guys from a mix of countries like Saudi Arabia, among others that just got lucky.
Hmm…there is something just a little suspicious besides 3 buildings collapsing in perfect demolition form going on here. Maybe we should actually investigate crimes? All sarcasm intended. Just shows the Level and depth of corruption that had to be involved to get NIST to ever suggest it was anything other than a controlled demolition…. All you have to do is open your eyes….
As Canadians we have a lot to learn from this scientific process. Our buildings are structured on the same standards. I heard the owner of bldg. Also, my daughter lives in the U. My 9th grade physics class was enough to tell me that. This study follows suit, and hopefully, it will become the cornerstone to eventually discovering the full truth of that day, and those who precipitated it.
I commend Dr. Hulsey and his team for their excellent report. This revelation is but the tip of the iceberg. There is much more to this story! Since the dawn of skyscrapers, there has been no highrise steelbuildings ever, to collapse from fire. Yet on 11 september , three such structures miraculously happened to do just that.
I detest the stench of foul play, just as much as a despise the cowards hiding murderers. Daily Commercial News is to be commended for publishing a balanced and factual article about an issue that most media outlets are still too cowed to touch. One point deserves clarification for those unfamiliar with the layout of the World Trade Center.
Building 7 was a full metres away from the nearest of the Twin Towers the North Tower , and was separated from it by another major building WTC 6.
Exactly how much has never been made clear, but NIST itself dismissed the possibility that the damage contributed to the structural weakening of the building. For not giving up, thanks to you more than half the country does not believe the story told. Sooner or later they will have to come to terms with who really did this, and I am hoping for a great awakening. Controlled demolition would leave obvious visible evidence on the steel structural elements of the building after the building collapsed.
That evidence would be clear to anyone and everyone at the site after the dust settled. It would be unmistakable. Engineers whose objective is to argue against and not look for structural explanations for building collapses are not going to find them. Thank you Leroy Hulsey and team for providing irrefutable scientific evidence of what did and did not happen to Building 7.
The door is wide open for NIST to make the corrections. It showed that it was impossible. But the truth of the free-fall collapse is very simple. Just looking at the video clips of the story building dropping symmetrically, with little deformation reveals to most open-people that it was a controlled demolition.
Just watch it, and judge for yourself. In this vein, I would like to point to a very important expert interview that is incredibly damning of the official story. The interview was conducted by Dutch television reporters, who asked Danny Jowenko, a leading building demolition expert in Europe, what he saw when they showed him a clip of WTC 7 falling. They did not tell him what building it was beforehand, nor did he appear to recognize it. His immediate and unequivocal reaction was that it was a controlled demolition.
The interview is in three parts on YouTube, in Dutch with English subtitles. Here is a link to the first part:. Excellent article, thank you. And well done to all the architects and engineers who tirelessly helped realise this important scientific body of work.
The findings from UAF are unimpeachable. A full copy of the report is available for free at the University website, where all professionals should see for themselves. Hulsey et al, and all those at AE truth, are to be commended for their perseverance and bravery. WTC 7 was clearly visible behind her in the background. This has now been confirmed by University of Alaska Fairbanks. My compliments for this honest and factual reporting.
Thank you. Spurred by conspiracy theorists' questions, investigators did look specifically at the possibility that explosives were involved. NIST's press release and other material on the report can be found here. Click here to download the full report in pdf form. The Planes. Where's The Pod? The Pentagon. Flight Type keyword s to search. The growth and spread of the lower-floor fires due to the loss of water supply to the sprinklers from the city mains was enough to initiate the collapse of the entire building due to buckling of a critical column in the northeast region of the building.
Did the electrical substation beneath WTC 7 play a role in the fires or collapse? There is no evidence that the electric substation contributed to the fires in WTC 7. The electrical substation continued working until p. Alarms at the substation were monitored, and there were no signals except for one event early in the day. No smoke was observed emanating from the substation.
Special elements of the building's construction—namely trusses, girders, and cantilever overhangs, which were used to transfer loads from the building superstructure to the columns of the electric substation over which WTC 7 was constructed and foundation below—also did not play a significant role in the collapse.
The building had three separate emergency power systems, all of which ran on diesel fuel. As background information, the three systems contained two 12,gallon fuel tanks, and two 6,gallon tanks beneath the building's loading docks, and a single 6,gallon tank on the 1st floor.
In addition, one system used a gallon tank on the 5th floor, a gallon tank on the 8th floor, and a gallon tank on the 9th floor. Another system used a gallon day tank on the 7th floor. Several months after the WTC 7 collapse, a contractor recovered an estimated 23, gallons of fuel from these tanks.
The fate of the fuel in the day tanks and the two 6,gallon tanks was unknown, so NIST assumed they were full on Sept. NFPA acknowledges that each investigation is unique, and that some investigations will require broader procedures than it can accommodate. The investigation was carefully planned, sources of information were identified and contacted, the building fire and collapse event and the investigation were documented, available evidence was obtained including documents about the design and construction of the structure , and the origin of the fire was determined based on images, laboratory testing conducted for the towers, but applicable to WTC 7 , and mathematical analyses.
Additionally, in its study of WTC 7, NIST considered all available data and evaluated a range of possible collapse mechanisms: uncontrolled fires on the tenant floors, fuel oil fires, hypothetical blast events, and fires within the Con Ed substation. NIST developed a working hypothesis, modeled the fires and the building, and then used the models to test the hypothesis against the observed behavior of the building.
This approach is fully consistent with the principles of scientific inquiry. Steel samples were removed from the site before the NIST investigation began.
In the immediate aftermath of Sept. Once it was removed from the scene, the steel from WTC 7 could not be clearly identified.
Unlike the pieces of steel from WTC 1 and WTC 2, which were painted red and contained distinguishing markings, WTC 7 steel did not contain such identifying characteristics.
NIST's entire investigation included no physical evidence. How can the investigators be so sure they know what happened? The steel for WTC 1 and WTC 2 contained distinguishing characteristics that enabled it to be identified once removed from the site during recovery efforts. However, the same was not true for the WTC 7 steel. Certainly, there is a lot less visual and audio evidence of the WTC 7 collapse compared to the collapses of the WTC 1 and WTC 2 towers, which were much more widely photographed.
These data come from extensive research, interviews, and studies of the building, including audio and video recordings of the collapse.
Rigorous, state-of-the-art computer methods were designed to study and model the building's collapse. These validated computer models produced a collapse sequence that was confirmed by observations of what actually occurred. In addition to using its in-house expertise, NIST relied upon private-sector technical experts; accumulated copious documents, photographs and videos of this disaster; conducted first-person interviews of building occupants and emergency responders; analyzed the evacuation and emergency response operations in and around WTC 7; performed computer simulations of the behavior of WTC 7 on Sept.
This investigation is the first to show how fire can cause progressive collapse in a building. It is also the first to show that under certain conditions thermal expansion effects—rather than loss of strength and stiffness due to fire—can lead to structural collapse. This was an analysis of unprecedented complexity—an end-to-end computer run for the WTC towers on some powerful computers took about two months while a similar run for WTC 7 took about eight months, or about four times as long.
NIST expects that the tools developed from this investigation, as well as the knowledge obtained from it, will aid in the development of more robust building design practice and in studies of future building collapse processes.
These expanded tools and derived, validated, and simplified analysis approaches can guide practitioners and prevent future disasters. The simulation of the collapse modeling of WTC 7 does not match the video footage of the collapse. In particular, the large inward deformations of the upper exterior walls after the beginning of global collapse are not visible in the video footage.
Can NIST explain the difference between the results of its computer model of the collapse and the available video evidence? NIST conducted two global collapse analyses, one that included damage due to debris impact from the collapse of WTC 1, and one that did not include any debris-impact damage. These two analyses were conducted to determine the influence of the debris-impact damage on the response of WTC 7 when subjected to the effects of the fires that burned on floors 7 to 9 and 11 to NIST believes that the simulation of the collapse, based on the analysis with debris-impact damage, does capture the critical observations derived from the digital video recording.
The critical observations and corresponding failures identified in the structural analysis include: 1 east-west motion of the building beginning at approximately the same time as failure of floors 6 through 14 around Column 79, 2 the formation of the "kink" in the roofline of the east penthouse approximately one second after Column 79 was found to buckle, 3 window breakage on the east side of the north face as the buckling of Column 79 precipitated the failure of upper floors, and 4 the beginning of global collapse vertical drop of the building exterior within approximately one-half second of the time predicted by analysis.
Both measured time and analytically predicted time, from the start of failures of floors surrounding Column 79 to the initial downward motion of the north face roofline, was Only in the later stages of the animation, after the initiation of global collapse, do the upper exterior wall deformations from the NIST analysis differ from the video images. It is well known that such non-structural components can increase the stiffness and strength of a structural system, but their contribution is difficult to quantify.
Given these factors, disparities between the video and the animation in the later stages of collapse would be expected. Other videos of the WTC 7 collapse show the penthouse falling first, followed by the rest of the building.
The footage was not edited in any way by NIST. NIST received videos directly from many different sources during its technical investigation of the collapse of World Trade Center 7. Videos were logged into a database as they were received and were accessible only to those working on the investigation. NIST protected the integrity of the original videos at all times. Many of these videos are available online. For the WTC 7 story model for structural response to fire effects, why did NIST model the girders without shear studs, given that articles published in the open literature showed drawings of typical floor framing plans of WTC 7 with shear studs on the girders?
The source documents used for developing the structural analysis models of WTC 7 were the structural drawings prepared by the structural engineer of record Irwin G. Cantor, Structural Engineers and the erection drawings prepared by the steel fabricator and erector Frankel Steel Limited. A structural drawing showing modifications to Floor 10 Structural Drawing S to accommodate increased floor loads in certain areas did indicate shear studs for the girders in the affected areas, though the additional load was not identified on the drawing.
The modification also indicated reinforcing some floor connections and adding new plates on the bottom flanges of some north and south floor beams. A paper by J. NIST says that debris from the collapse of the North Tower ignited fires on at least 10 floors of World Trade Center 7, some of which burned out of control because the automatic sprinkler system for some floors had failed partly due to city water lines damaged by the collapse of the Twin Towers. Heat from the fires then caused steel support beams to expand which led to several floors collapsing.
This then triggered a number of other structural failures, which eventually resulted in the whole building collapsing. This article is part of our work fact checking potentially false pictures, videos and stories on Facebook. You can read more about this—and find out how to report Facebook content— here.
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