Keep in mind, no verified plans have ever been made available for the towers. The reason for this is to keep the concrete core a secret.
DISCLAIMER
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THE FEMA CORE
A deception
Below is a sequenced analysis of 4 images explaining,
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THE SPIRE
Below, the tip of the spire emerges from the Debris Cloud as a section of the concrete core explodes on the North east side of WTC 1. The perimeter walls and floors have already fallen. Cutting charges in the 2 faces (north and west) of framed box column structural steel framework inner tube wall below the spire failed to initiate as the C4 had been exposed to air too long during a phase of construction and would not detonate. Winter work on floors did not progress to encapsulate the C4 before freezing temperatures and thawing occurred. Both faces had much floor and rebar in the upper areas near the spire, about 500 feet, of exposed and non viable "special protective plastic coating", rendered non viable by freezing and exposure before being sealed in concrete.
Concrete of core walls exploding through the steel frame work or the 10 x 20 foot holes between columns and floor beams which prevent the uncut framework from falling.
Below a large triangle of concrete can be seen falling into the core area. That is a piece of the east concrete shear wall of the WTC 1 core.
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Below, on the South west side of WTC 1, opposite of the above image, a second later after the heavy debris has hit the ground and displaced the lower dust cloud, the spire is seen to be supported by the rectangles of floor beams on the right base of the west face. To the right in the image, downward from the spire is a sloping portion, then yet one more short spire of 2 rectangular frames of interior box columns and floor beams. The sloping area is the face of the concrete shear wall.
The below image locates the spire at the northwest corner of the core.
Below is the same basic spire viewed from the East side, across the empty core. The WTC 1 spire is not a core column.
Below is a photo of the spire from the North west side looking down the western concrete core wall line. The concrete wall of the core and interior walls interrupted by hallways can just be seen.
This image locates the spire outside the concrete shear wall of the core.
Below is an enlarged image of the image above with arrows indicating the structural elements.
Now, what happens is similar to the top image. In order to have some image representing the event, I use it again below because the appropriate image hasn't been found yet as the explosion of the core described is lower and behind buildings for the most part. What is different in that explosion is that the spire falls and another lower, semi vertical element appears from out of the top of the debris wave, rebar. As seen in the second image down.
That explosion leaves,
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REBAR,
It leaves rebar, because, like the cutting charges in the floors for the interior box columns, the rebars C4 coating had been exposed to weather and would not detonate. The below photo has a comb like shape of the remnant of the reinforcing bars of the core, briefly standing. The FEMA report does not account for any structural element this small. The box columns in the spire image at the top are about the same size as the steel columns the core was supposedly made from at approximately 7500 feet.
New horizontal bar had been tied into the rebar before pouring and that was what had removed the concrete from the vertical rebar, LEAVING the large vertical rebar standing as we see it in the below photo. The non viable C4 left the vertical rebar standing
The slope to the top of the rebar was mentioned in the documentary. The engineers specified that the concrete pours not terminate with level opposing joints across the tower to maximize the strength of the tubular concrete tower core as an anti torsion element. Also the high tensile steel rebar was to be welded in series of butt joints in a slope across the walls of the core. Slopes of concrete and welds ran in opposite directions on opposite sides maximizing torsion resistance of the tube. The slope of the tops of the rebar in the photo below show this.
The rebar was very tightly tucked into the concrete side of the spire. Note that the top of the rebar is slightly lower. If the spire image above (3rd image down) is examined closely, very small projections are seen on the right side. After the explosions lower down drop the steel, the rebar is seen.
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Additional support for the concrete core
THE WTC 2 CORE FALLING
