The 9/11 Forum

achimspok wrote:That Gif isn't up to date anymore.

That's what I think:


You can use the 3D overlays. These should be much better than the Gif you mentioned. But from the outdated Gif you know that some of the upright columns were extreme deflected and stood up again. We can just hope that they don't leaning in all directions.

You mean the columns are 1002, 902, 1004, 1005, 1006.

In the floor drawing you use, 902 is misplaced; It must be aligned with 1002. Also all visible columns should be from the same row, 900 or 1000. Because the next row is hidden by the dust and could not be visible.

I would tell the columns are 1004, 1005, 1006(invisible), 1007, 1008. Is it possible?

There is a small possibility for the right front column to be 1008. This is just because the whole remnant fell towards south. On the other hand some videos suggest at least 3-5seconds of still standing and NO photograph or video so far has shown the columns in the northern position.


This is the position of the core in this view:


In the first moment the vertical black edge becomes visible it appears already to be left of the Hilton and therefore no 1008 should be included. But that video isn't good enough to prove anything. Maybe it would help to synchronize it with any other collapse video.

View from the western half of the ~88th story of the Empire State Building: -http://www.youtube.com/watch?v=c_6mVVUTpNY#t=3m8s

How does this help:



Gordon Ross, source.

achimspok wrote:

The cores are not oriented the same way...

Matt wrote:How does this help

Not sure. Think a rotoscope is in order.

Gordon Ross, source.

Eh ?

Gordon grabbed it from Mehmeti (with permission) a few years ago.

This is the first clip I have seen which can be used to estimate the height of the WTC2 spire. The black building serves as reference markers.

http://www.youtube.com/user/Xenomorph911WTC#p/u/6/paOfROQ00a0

One Liberty Plaza, formerly the U.S. Steel Building, is a skyscraper in lower Manhattan, New York City, at the location of the former Singer Building (in 1968, the third tallest structure ever demolished). 1 Liberty Plaza is currently owned and operated by Brookfield Properties. The building is 743 ft (226 m) high and 54 floors. It was built in 1973. At 2,200,000 sq ft (204,000 m2), each floor offers almost 1 acre (4,047 m2) of office space, making it one of the largest office buildings in New York.

Its facade is black, consisting of a structural steel frame. The building was originally commissioned by U.S. Steel. It once housed the headquarters of Merrill Lynch. Currently, a variety of tenants occupy the space, from large law firms, such as Cleary Gottlieb Steen & Hamilton, to public and not-for-profit agencies like the Lower Manhattan Development Corporation and the World Trade Center Memorial Foundation.

The building is bordered by Broadway, Cortlandt Street, Church Street and Liberty Plaza.

The collapse of the core can be explained by Euler buckling which describes that steel long column with slenderness ratios of more than 1/150 will buckle from their own weight.

This condition presented when the collapse stripped away the bracing effectively increasing the unbraced length to a slenderness ratio of an unstable column.

The first 30 seconds of this video shows at least 1 pair of core columns falling to the north.

This means that the analysis done on the first page was very good.

If you go back over at the attempts to locate the surviving remnant relative to the original core, it has been consistently correct, placing the surving remnant more to the south.

Impressive.

I think this shows there is more depth to the core than the 1000-900 row columns.

The nearest corner column is not 1008 because we saw two different pairs fall to the east in the last post.

The closest may be CC1006. Note that the width of the closest colunms appears thicker than the ones on the left. This is why I think the nearer, thicker ones are from the 1000-900 rows but the thinner ones on the left are from the 800-700 rows.

Moments before there are 2 pairs of columns falling to the right, away from the columns in the image above.



My guess is that the first pair is 1008-908 and the second is 1007-907.

This leaves 1006 standing as the new corner column that is seen in the surviving remnant. ??

From north (West Broadway):



I think that this falling away column (or column pair) is the same as that one in the Luiggi Cazzaniga clip.
Hm, the most right still standing column is either from the 600 or 500 row.

Cropped and enlarged: