Figure C
.
Interior box columns, the inner wall of the outer tube, a steel framework supporting the floors, surrounds the core area. Elevator guide rail support steel stands in the center. This vertical steel is misinterpreted as core columns.
Figure D
.
The elevator guide rail support steel has butt plates welded to the ends. This is only adequate for elements that will not have to absorb lateral loads. Core columns must have a 100% deep fillet weld.
Figure E
.
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. Some of the interior box columns Cutting charges and floors did not detonate on the north side of WTC 1 because bad weather struck early in 1969 and concrete was not poured leaving the C4 plastic coating on the rebar and lightly covered in the floors exposed to evaporation and oxidization. The undetonated explosives left the steel comprising the spire standing.
Figure F
.
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. More rebar left exposed during the winter perhaps. The spire is just barely visible in this low res scan of a photo.
Figure G
.
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.
Figure H
.
The below image locates the spire at the northwest corner of the core.
Figure I
.
Below is the same basic spire viewed from the East side, across the empty core. The WTC 1 spire is not a core column. No core columns are seen left and behind the spire.
Figure J
.
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. Note, no steel core columns are seen in the core area left of the sprier.
Figure K
.
Below is an enlarged image of the image above with arrows indicating the structural elements.
Figure L
.
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.
Figure M
..
Here is the final seconds of the South spire shown in the earlier photo. A violent shock wave from below knocks the remnants of concrete from an area of core wall next to the steel dropping the spire as seen here in an animated gif. (This .gif looses the last frames at times and the last drop is not seen.)
Figure O
Back to the Demolition of the Towers.
