How Many Buildings Collapsed on 9/11 2001?

Question

Many will say only two buildings collapsed on 9/11. Well actually three buildings collapsed. Word trade center building 7 collapsed into it's own foot print at near free fall speed. It collapsed at 5:20 pm. WTC 7 was not hit by an airplane yet it collapsed in the same fashion as the Twin Towers. In the final 9/11 Commission report the collapse of WTC 7 was not mentioned once. Even NIST has failed to provide a conclusive reason for the collapse of WTC 7. NIST stands for (National Institute of Standards and Technology)

Video : http://www.youtube.com/watch?v=LD06SAf0p9A

Read what NIST says about WTC 7 :

NIST also is considering whether hypothetical blast events could have played a role in initiating the collapse. While NIST has found no evidence of a blast or controlled demolition event, NIST would like to determine the magnitude of hypothetical blast scenarios that could have led to the structural failure of one or more critical elements.

GOOGLE NIST wtc 7

Answer 1

Read MORE of what NIST says about the collapse of WTC 7:

With the benefit of more time and resources, NIST researchers now support the working hypothesis that WTC 7 was far more compromised by falling debris than the FEMA report indicated. "The most important thing we found was that there was, in fact, physical damage to the south face of building 7," NIST's Sunder tells PM. "On about a third of the face to the center and to the bottom — approximately 10 stories — about 25 percent of the depth of the building was scooped out." NIST also discovered previously undocumented damage to WTC 7's upper stories and its southwest corner.

NIST investigators believe a combination of intense fire and severe structural damage contributed to the collapse, though assigning the exact proportion requires more research. But NIST's analysis suggests the fall of WTC 7 was an example of "progressive collapse," a process in which the failure of parts of a structure ultimately creates strains that cause the entire building to come down. Videos of the fall of WTC 7 show cracks, or "kinks," in the building's facade just before the two penthouses disappeared into the structure, one after the other. The entire building fell in on itself, with the slumping east side of the structure pulling down the west side in a diagonal collapse.

According to NIST, there was one primary reason for the building's failure: In an unusual design, the columns near the visible kinks were carrying exceptionally large loads, roughly 2000 sq. ft. of floor area for each floor. "What our preliminary analysis has shown is that if you take out just one column on one of the lower floors," Sunder notes, "it could cause a vertical progression of collapse so that the entire section comes down."

There are two other possible contributing factors still under investigation: First, trusses on the fifth and seventh floors were designed to transfer loads from one set of columns to another. With columns on the south face apparently damaged, high stresses would likely have been communicated to columns on the building's other faces, thereby exceeding their load-bearing capacities.

Second, a fifth-floor fire burned for up to 7 hours. "There was no firefighting in WTC 7," Sunder says. Investigators believe the fire was fed by tanks of diesel fuel that many tenants used to run emergency generators. Most tanks throughout the building were fairly small, but a generator on the fifth floor was connected to a large tank in the basement via a pressurized line. Says Sunder: "Our current working hypothesis is that this pressurized line was supplying fuel [to the fire] for a long period of time."

WTC 7 might have withstood the physical damage it received, or the fire that burned for hours, but those combined factors — along with the building's unusual construction — were enough to set off the chain-reaction collapse.

Answer 2

Isn't it amazing what they can do with computers. Look almost real, but not quite !!!

Answer 3

I dont know what point you are trying to prove here. But all the buildings fell due to controlled demolition

Answer 4

Well, actually a lot more then 3 buildings fell or were severely damaged from the attacks.  The list includes:

1&2 World Trade Center (the twin towers)

7 World Trade Center (the one truthers focus on)

6 World Trade Center

5 World Trade Center

4 World Trade Center

The Marriott World Trade Center

St. Nicholas Greek Orthodox Church

The Deutsche Bank

And, here are all your answers about WTC7:

http://www.debunking911.com/pull.htm

Here's the information on the free fall speeds:

http://www.debunking911.com/freefall.htm

Best of luck

Answer 5

Yep and it all be kept under wraps how?

When 1 prince can get under cover for more than a week.

http://answers.yahoo.com/question/index?...

For a dose of reality:s***w Loose Change Video. (Yes, it's finally here)

http://www.lolloosechange.co.nr/

Loose Trains

http://loosetrains911.blogspot.com/

Salon - The 9/11 deniers

http://www.salon.com/ent/feature/2006/06...

SciAm blog about conspiracists' reaction to Shermer

http://sciam-editor.typepad.com/weblog1/...



In These Times: Nightmares of Reason: Sorting fact from fiction in 9/11 conspiracy theories

http://www.inthesetimes.com/issue/26/15/...



The September 11 X-Files

http://www.thenation.com/blogs/capitalga...



Interview with Prof. Jonathan Barnett, an expert in structural and fire protection engineering who was one of the WTC investigators

http://www.wpi.edu/News/Transformations/...



Snopes debunks "Hunt the Boeing", a conspiracy site based on Thierry Meysan’s (and David Ray Griffin’s) claim that a missile, not AA77, hit the Pentagon

http://www.snopes2.com/rumors/pentagon.h...



Wikipedia articles on conspiracy theory characteristics

http://en.wikipedia.org/wiki/Conspiracy_...

http://en.wikipedia.org/wiki/Conspiracis...

Journal Of Debunking 9/11 Conspiracy Theories

http://www.jod911.com

Engineers Explain WTC Collapse

http://www.architectureweek.com/2002/052...

Report Ties WTC Collapses to Column Failures

http://enr.construction.com/news/buildin...

IT WAS THE FIRE, CAUSED THE TWIN TOWER COLLAPSE - icivilengineer.com

http://www.icivilengineer.com/News/WTC/F...

Simulation for the collapse of WTC after aeroplane impact - Lu XZ., Yang N., Jiang JJ. Structure Engineer, 66(sup.). 2003, 18-22

Bazant, Z.P., & Zhou, Y.

"Addendum to 'Why Did the World Trade Center Collapse? - Simple Analysis"  (pdf)

Journal of Engineering Mechanics v. 128, no. 3, (2002): 369-370.

Brannigan, F.L.

"WTC: Lightweight Steel and High-Rise Buildings"

Fire Engineering v.155, no. 4, (2002): 145-150.

Clifton, Charles G.  

Elaboration on Aspects of the Postulated Collapse of the World Trade Centre Twin Towers

HERA: Innovation in Metals. 2001. 13 December 2001.

"Construction and Collapse Factors"

Fire Engineering v.155, no. 10, (2002): 106-108.

Corbett, G.P.

"Learning and Applying the Lessons of the WTC Disaster"

Fire Engineering v.155, no. 10, (2002.): 133-135.

"Dissecting the Collapses"

Civil Engineering ASCE v. 72, no. 5, (2002): 36-46.

Eagar, T.W., & Musso, C.

"Why Did the World Trade Center Collapse? Science, Engineering, and Speculation"

JOM v. 53, no. 12, (2001): 8-12.

Federal Emergency Management Agency, Therese McAllister, report editor.

World Trade Center Building Performance Study: Data Collection, Preliminary Observations, and Recommendations

(also available on-line)

Gabrielson, T.B., Poese, M.E., & Atchley, A.A.

"Acoustic and Vibration Background Noise in the Collapsed Structure of the World Trade Center"

The Journal of Acoustical Society of America v. 113, no. 1, (2003): 45-48.

Glover, N.J.

"Collapse Lessons"

Fire Engineering v. 155, no. 10, (2002): 97-103

Marechaux, T.G.

"TMS Hot Topic Symposium Examines WTC Collapse and Building Engineering"

JOM, v. 54, no. 4, (2002): 13-17.

Monahan, B.

"World Trade Center Collapse-Civil Engineering Considerations"

Practice Periodical on Structural Design and Construction v. 7, no. 3, (2002): 134-135.

Newland, D.E., & Cebon, D.

"Could the World Trade Center Have Been Modified to Prevent Its Collapse?"

Journal of Engineering Mechanics v. 128, no. 7, (2002):795-800.

National Instititue of Stamdards and Technology: Congressional and Legislative Affairs

“Learning from 9/11: Understanding the Collapse of the World Trade Center”

Statement of  Dr. Arden L. Bement, Jr., before Committee of Science House of Representatives, United States Congress on March 6, 2002.  

Pinsker, Lisa, M.

"Applying Geology at the World Trade Center Site"

Geotimes v. 46, no. 11, (2001).

The print copy has 3-D images.

Public Broadcasting Station (PBS)

Why the Towers Fell:  A Companion Website to the Television Documentary.

NOVA (Science Programming On Air and Online)  

Post, N.M.

"No Code Changes Recommended in World Trade Center Report"

ENR v. 248, no. 14, (2002): 14.

Post, N.M.

"Study Absolves Twin Tower Trusses, Fireproofing"

ENR v. 249, no. 19, (2002): 12-14.

The University of Sydney, Department of Civil Engineering

World Trade Center - Some Engineering Aspects

A resource site.

"WTC Engineers Credit Design in Saving Thousands of Lives"

ENR v. 247, no. 16, (2001): 12.

The Towers Lost and Beyond

http://web.mit.edu/civenv/wtc/

Massachusetts Institute of Technology

Eduardo Kausel, John E. Fernandez, Tomasz Wierzbicki, Liang Xue, Meg Hendry-Brogan, Ahmed F. Ghoniem, Oral Buyukozturk, Franz-Josef Ulm, Yossi Sheffi