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Pilots For 9/11 Truth Forum _ World Trade Center Complex _ Wtc 1,2, & 7 Building Descriptions

Posted by: Leslie Landry May 29 2008, 11:08 AM

2.1 Building Descriptions

2.1.1 General

The WTC towers, also known as WTC 1 and WTC 2, were the primary components of the seven building World Trade Center complex. Each of the towers encompassed 110 stories above the Plaza level and seven levels below. WTC 1 (the north tower) had a roof height of 1,368 feet, briefly earning it the title of the world's tallest building. WTC 2 (the south tower) was nearly as tall, with a roof height of 1,362 feet. WTC 1 also supported a 360-foot-tall television and radio transmission tower. Each building had a square floor plate, 207 feet 2 inches long on each side. Corners were chamfered 6 feet 11 inches. Nearly an acre of floor space was provided at each level. A rectangular service core with overall dimensions of approximately 87 feet by 137 feet, was present at the center of each building, housing 3 exit stairways, 99 elevators, and 16 escalators. Note, that this description of the core is meant to mislead the reader by directing attention away from the cores main purpose, which was to support most of the gravity load (weight) of the building and to reduce it to just "an entrance and exit". Both the central core and the outer wall supported the gravity load (were load bearing). The core provided the strength needed to support the bulk of the weight, while the outer wall provided the necessary rigidity to resist lateral loading due to the wind. The requirement to resist lateral loading, is the dominant feature determining the design of tall buildings. Figure 2-1 presents a schematic plan of a representative above ground floor.

Photo of early construction (10th floor level above grade). Notice the large central core columns. Each of the perimeter columns (except the corner columns) split into 3 smaller columns above the plaza level.

The project was developed by the Port Authority of New York and New Jersey (hereafter referred to as the Port Authority), a bi-state public agency. Original occupancy of the towers was dominated by government agencies, including substantial occupancy by the Port Authority itself. However, this occupancy evolved over the years and, by 2001, the predominant occupancy of the towers was by commercial tenants, including a number of prominent financial and insurance services firms.

Design architecture was provided by Minoru Yamasaki & Associates, and Emery Roth & Sons served as the architect of record. Since these companies have nothing to hide, they should provide the architectural plans of the WTC to the world, so that any misunderstandings regarding the facts of the collapse, may be established. In fact, Minoru Yamasaki & Associates, and Roth & Sons, or their descendent companies, should put the entire set of architectural plans on the internet. Skilling, Helle, Christiansen, Robertson were the project structural engineers; Jaros, Baum & Bolles were the mechanical engineers; and Joseph R. Loring & Associates were the electrical engineers. The Port Authority provided design services for site utilities, foundations, basement retaining walls, and paving. Ground breaking for construction was on August 5, 1966. Steel construction began in August 1968. First tenant occupancy of WTC 1 was in December 1970, and occupancy of WTC 2 began in January 1972. Ribbon cutting was on April 4, 1973.

<a name="2.1.2">2.1.2 Structural Description

WTC 1 and WTC 2 were similar, but not identical. WTC 1 was 6 feet taller than WTC 2 and also supported a 360-foot tall transmission tower. The service core in WTC 1 was oriented east to west, and the service core in WTC 2 was oriented north to south. Service core, service core,... more propaganda. The more you are told the core is just for servicing the building, the more you believe it. Right? In addition to these basic configuration differences, the presence of each building affected the wind loads on the other, resulting in a somewhat different distribution of design wind pressures, and, therefore, a somewhat different structural design of the lateral-force-resisting system. In addition, tenant improvements over the years resulted in removal of portions of floors and placement of new private stairways between floors, in a somewhat random pattern. Figure 2-2 presents a structural framing plan representative of an upper floor in the towers.

please visit the website to learn more about these buildings:

Posted by: dMole Jul 14 2008, 11:30 PM

WTC1 & 2 info

Posted by: dMole Jul 14 2008, 11:36 PM

Some WTC7 building info is at:

Richard Gage's email from Jan. 4, 2007 to NIST:

WTC7 and FEMA report:

More on WTC7:

Posted by: dMole Jul 15 2008, 09:49 PM

14 Point Destruction of the NIST & FEMA Reports

Also see Chapter 2 of NIST NCSTAR 1-1:

And Appendix E (esp. for column and metallurgical info):

NIST report general info:

Building a Better Mirage

NIST Main WTC Page

NIST FAQ (Aug. 30, 2006):

NIST WTC archives

Posted by: dMole Jul 17 2008, 04:06 PM

WTC1N Tower Blueprints

WTC1N Blueprint Index Page

WTC Modeling

There is a lot of info at jakeogh's page:
Perimeter columns

Core columns

NIST core column data

NIST NCSTAR 1-3: Mechanical and Metallurgical Analysis of Structural Steel

Safety factor and other technical info

Posted by: dMole Jul 18 2008, 12:06 AM

WTC2 South Tower Tenants

WTC1 North Tower Tenants

Posted by: dMole Jul 21 2008, 07:29 AM

WTC7 Tenants

Posted by: dMole Jul 21 2008, 07:38 AM

Some WTC 1 & 2 data from:

Parameter Value (lengths in m) [US feet]
building width 63.14 [207.1522309711 ft]
building depth 63.14 [207.1522309711]
core width 41.8 [137.1391076115]
core depth 26.52 [87.0078740157]
perimeter column count 236 (59 per side)
core column count 47
story height 3.6576 [12.00]
perimeter column spacing 1.02 [3.3464566929]
number of long span trusses 60 (30 per side)
number of short span trusses 28 (14 per side)
truss spacing 2.04 [6.6929133858]
number of transverse trusses 8
transverse truss spacing 4.08 [13.3858267717]

World Trade Center Plaza map, with linked building descriptions:

Posted by: dMole Jul 21 2008, 10:32 AM

Some information about the LERA SAP 2000 Finite Element Analysis (FEA) computer models:

Posted by: amazed! Jul 21 2008, 05:40 PM

You've been doing hard work dMole, thanks for all of it. handsdown.gif

Posted by: dMole Jul 27 2008, 04:54 PM

OK, I've found a WTC tower discrepancy that I haven't seen discussed anywhere else yet (much more significant than the 6-13 foot height discrepancies for WTC1N & WTC2).

If we use the 12.00 foot height per floor in my post #8 above (or "level" for the semantically-pedantic "debunkers" out there- hi guys!):

110 floors * 12.00 feet/floor = 1320.00 feet.

According to:

we have WTC1N at 1368 feet and WTC2 at 1362 feet. That's nearly a 50-foot discrepancy in WTC tower height.

I'll assume it could be in the "hat truss" construction or in the lobbies, but this is an assumption on my part. Then there's the fact that there were apparently 6 basement levels for a total of 116 "levels" [a fact that many keep omitting, I have noticed].

Does anyone have input here?

EDIT: Another discrepancy- Section 2.2 of NCSTAR 1-3 states: "Skilling, Helle, Christiansen, and Robertson (SHCR), structural engineers for the WTC towers." [53 of 184, p. 5]

Problem is, the North Tower blueprints state "Worthington, Skilling, Helle, & Jackson, Structural Engineers." [I looked at the 80thFloorPlan, the rough impact location for WTC2 South]

Posted by: amazed! Jul 27 2008, 09:31 PM

Wish I could help, but I've heard the 6 levels of basement before.

Posted by: dMole Aug 24 2008, 05:57 PM

More links on the WTC Plaza:


Posted by: Leslie Landry Sep 6 2008, 09:53 PM

Building the World Trade Center and Twin Towers

Posted by: dMole Sep 11 2008, 07:30 AM

Yet more NIST "discrepancies" from:

Core Column Data

"NIST indicates that the plates of the box columns were up to 7 in. (178 mm) thick. There seems to be a problem with this thickness since columns 12 in. in width could not accommodate sides of 7 in. in thickness. The following figure shows NIST's understanding of the layout of the core columns and the floors of transition from box columns to I-beams."


"The architectural drawings differ from the NIST data in the floors at which the column transitions [from box core columns to Wide Flange (WF) I-beams] are made. The following figure gives the transition floors from this [architectural] source."

Architectural source

vs. NIST version

Does anyone care to guess how this affects all those NIST/LERA computer "simulations?"

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