9/11 Physics Truth

Tower Structure

	The World Trade Center towers were not just rectangular shells with 110 floors. The outside surface of the towers hid a lot of structure inside that we need to understand. The most important structures were: the core columns running up the middle, the perimeter columns around the outside, the floors, and the truss structures holding up the floors, connecting to the columns.

The World Trade Center towers were not just rectangular shells with 110 floors. The outside surface of the towers hid a lot of structure inside that we need to understand.

The most important structures were:

the core columns running up the middle,
the perimeter columns around the outside,
the floors, and
the truss structures holding up the floors, connecting to the columns.

This photograph (copied from Studyof911.com) is explained on Understanding The Silhouetted Images Of The Twin Towers. The towers had a strong core structure and perimeter columns all around the outside. The 47 core columns held up approximately 60% of the vertical load, and the 244 perimeter columns distributed the remaining 40% across the four walls, 10% per wall. (See Why Trade Center Towers Stood, Then Fell, November 11, 2001, which gives the official conspiracy theory, along with some useful info.)		Some people still try to make the incorrect case that there was only a relatively weak hollow core structure, or that it had concrete columns, or none at all. Here is a diagram showing what they wanted us to believe about the structure: All the elevator shafts were integrated with the core columns. Local elevators did not extend the entire height of the towers.

This photograph (copied from Studyof911.com) is explained on Understanding The Silhouetted Images Of The Twin Towers.

The towers had a strong core structure and perimeter columns all around the outside. The 47 core columns held up approximately 60% of the vertical load, and the 244 perimeter columns distributed the remaining 40% across the four walls, 10% per wall. (See Why Trade Center Towers Stood, Then Fell, November 11, 2001, which gives the official conspiracy theory, along with some useful info.)

Some people still try to make the incorrect case that there was only a relatively weak hollow core structure, or that it had concrete columns, or none at all. Here is a diagram showing what they wanted us to believe about the structure:
Weak central core columns

All the elevator shafts were integrated with the core columns. Local elevators did not extend the entire height of the towers.

In order for each floor to hold up all the floors above it, the columns in lower floors must be much stronger and heavier than those above. In fact, the core columns on the bottom were 10 times more massive compared to those near the top. So the rectangular-shaped towers were actually built more like pyramids internally, as suggested by this perspective image	Actual construction photos make the real structure clear. Notice the extensive horizontal and diagonal cross bracing, particularly on the corner columns of the core. Actual floor plans were withheld from the public for more than five years, and finally leaked by a whistleblower. (see Tower Blueprints - Surviving Evidence of the World Trade Center Attack ) The floor plans exposed the misrepresentation by FEMA and NIST of the true structure, which helped them support their theory of how a gravity-driven collapse occurred. The towers were designed, by standard building practice, such that the columns at each floor could resist the weight of 5 times all the floors above it. This means each tower could have had 5 times as many floors before being on the verge of collapsing under its own weight, as shown on the right. (Actually, it probably would have tipped over first.)

In order for each floor to hold up all the floors above it, the columns in lower floors must be much stronger and heavier than those above. WTC Tower in Perspective

In fact, the core columns on the bottom were 10 times more massive compared to those near the top.

So the rectangular-shaped towers were actually built more like pyramids internally, as suggested by this perspective image

Actual construction photos make the real structure clear. Notice the extensive horizontal and diagonal cross bracing, particularly on the corner columns of the core.

Elevator guide rail support

Actual floor plans were withheld from the public for more than five years, and finally leaked by a whistleblower. (see Tower Blueprints - Surviving Evidence of the World Trade Center Attack )

The floor plans exposed the misrepresentation by FEMA and NIST of the true structure, which helped them support their theory of how a gravity-driven collapse occurred.

The towers were designed, by standard building practice, such that the columns at each floor could resist the weight of 5 times all the floors above it.

This means each tower could have had 5 times as many floors before being on the verge of collapsing under its own weight, as shown on the right. (Actually, it probably would have tipped over first.)

	3D Visualization of WTC This video (posted by natetruth on youtube) shows the 3D structure throughout the towers, animated as if it were being constructed.

3D Visualization of WTC

This video (posted by natetruth on youtube) shows the 3D structure throughout the towers, animated as if it were being constructed.

	WTC Core Longish video (by mmmlink - on youtube) shows details of the strong, dense core column structure, in contrast to the misleading FEMA and NIST assumptions. (Note: don't take the diagonal cutting charges as a proposed theory. Take it as a possibility.)

WTC Core

Longish video (by mmmlink - on youtube) shows details of the strong, dense core column structure, in contrast to the misleading FEMA and NIST assumptions.

(Note: don't take the diagonal cutting charges as a proposed theory. Take it as a possibility.)

	WTC Finite Element Analysis This video (by mmmlink - on youtube) shows a fairly detailed model of the structure of the towers, and simulates the forces it would experience when parts are removed. Large portions of the structure can be removed before it fails. Heat is dissipated by the steel structure. Pancaked floors are not found in the debris. (Note, the illustrations of demolition charges should be taken as possibilities to consider.)

WTC Finite Element Analysis

This video (by mmmlink - on youtube) shows a fairly detailed model of the structure of the towers, and simulates the forces it would experience when parts are removed.

Large portions of the structure can be removed before it fails.
Heat is dissipated by the steel structure.
Pancaked floors are not found in the debris.

(Note, the illustrations of demolition charges should be taken as possibilities to consider.)

The dimensions of the towers were 208ft x 208ft x 1368ft (north), 1362ft (south). Volume = 60,000,000 ft ^ 3. The mass of each tower was about 317,500 tons. [2] Average density = 635,000,000 lb / 60,000,000 ft ^ 3 = 10.5 lb / ft^3. The 110 floors of each of the twin towers were composed of about 4 inches of concrete in steel pans, supported by steel trusses. Some "mechanical floors" had additional structural steel to support heavy machinery. "An early article about the project in the Engineering News-Record declared that “live loads on these [perimeter] columns can be increased more than 2,000 percent before failure occurs.” (See Dead On Arrival - The NIST 9/11 Report on the WTC Collapse by Mark H. Gaffney, who quotes from: “How Columns Will be Designed for 110-Story Buildings,” Engineering News-Record, April 2, 1964, p. 48-49.)

The dimensions of the towers were 208ft x 208ft x 1368ft (north), 1362ft (south). Volume = 60,000,000 ft ^ 3.
The mass of each tower was about 317,500 tons. [2]
Average density = 635,000,000 lb / 60,000,000 ft ^ 3 = 10.5 lb / ft^3.
The 110 floors of each of the twin towers were composed of about 4 inches of concrete in steel pans, supported by steel trusses. Some "mechanical floors" had additional structural steel to support heavy machinery.
"An early article about the project in the Engineering News-Record declared that “live loads on these [perimeter] columns can be increased more than 2,000 percent before failure occurs.” (See Dead On Arrival - The NIST 9/11 Report on the WTC Collapse by Mark H. Gaffney, who quotes from: “How Columns Will be Designed for 110-Story Buildings,” Engineering News-Record, April 2, 1964, p. 48-49.)

References

liberte	Latest page update: made by liberte , Oct 7 2009, 9:45 AM EDT (about this update About This Update Edited by liberte 2 images added 1 image deleted view changes - complete history)
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