Video - Selection of WTC Twin Towers Structural Drawings

A selection of drawings and schedules from the twin towers structural drawing books.

Incomplete Information

First of all, thanks for your effort!

Secondly, connection details are nice and fine, but not very useful if you haven't the floor-framing & concrete plans, as well as erection and shop drawings.

Were you able to obtain from NIST at least the floor framing-plans from B6 to 110th floor from each of the twin tower?
An index sheet of WTC1 structural drawings can be seen here:

K. Koenig

This is incomplete, you are

This is incomplete, you are correct. However, it is very useful. Details so far are from Books 1,2,3,4,5,6,7,8,9,10,11,12,13,18,19 and 20.
Whilst I don't have the drawings that you link to yet, it would be interesting as an experiment for you to ask me for a specific element detail at a particular place for either tower, and I will endevour to answer you here, including the detail and the relevant drawings.

This is now over 5GB of structural drawing books for the towers, and anyone who would think that they are of little use either does not know what they are looking at, or just hasn't looked properly. That said, I am not finished with my search for drawings and will continue to press for release of details indcluding those that you listed.

Should be interesting to see if I can get you the details you are after from the drawings that I have.

All the best.

This wasn't ment in a

This wasn't ment in a deragatory way in which you probably took it. I just want to have a complete picture of the design FIRST and then analyze each part of it. That's usually my modus operandi.

Drawing books don't provide structural-design overviews for each floor as framing plans do, nor do they visualize and describe in detail each structural member like fabrication-shop drawings do.
As I can see, these structural-drawing books contain only detailed info, like connection details, column & beam schedules, column & beam types, floor-damping units, etc.
You see the 21 drawing books listed in the linked index sheet also.

By the way, you should demand from NIST an entire re-scan of each drawing

- in higher scan quality (min. 600 dpi), more preferably in greyscale mode than B&W,

- each drawing sheet should be digitized in a single and uncompressed TIFF or PNG file (not lumped together in quality-lossy PDF files),

- each sheet should be ENTIRELY scanned with ALL drawing-frame borders visible, with no information missing/stripped off, like encountered missing parts of drawings in your NIST release many times).

This lazy and sloppy records-reproduction work is simply NOT ACCEPTABLE!

I didn't take that as

I didn't take that as derigitory at all Mr K. We're both after the same thing here and I understand that you want the sheets to give you an overview, and rightly so. Sorry if my reply seemed a bit sharp - I wasn't disagreeing. I was genuinely willing to go in and look for whatever detail you were after.

I tend to think that these sheets will be forthcoming at some point in time from NIST. It is however possible to use what we have in the meantime. For example, the centre to centre of the core columns is constant, but the span is not, because the cores get thinner as height progresses. So, as the span between say C501 and 502 will increase as the building gets higher, the span of the bridging element between will increase with it. This means that for that example, it is reasonably straightforward to know within 3 floors where any piece of bridging is. Without going to that trouble, we could alternatively bound the problem between 2 ranges.

The floor system in book 7 contains all the Laclede shop drawings as well as the truss and panel specific sheets. These are also marked with the relevant storeys that are covered, and I managed to collate the floor panels at floor 96 of tower A in under an hour. The external panels are all marked for storeys, as are the cores.

I also have the concrete reinforcing and core column concrete fireproofing details, which are in book 8. Refers mainly to below grade and sub 9th storey as you would expect. All in all we now have a lot more data about the towers than we ever did about WTC7, and while it might be a pain in the ass to have to trawl through them to ascertain what bridging belongs to which storey, it's not an insurmountable task to do so.

It is not something of little use to have the means of knowing exactly which element is where in these buildings, and that's what I objected to in your post. Sure, the framing plans would be handy, but there's no detail in them that cannot be extracted from what we have in these books. They are therefor of huge use to anyone with the ability to work through them and understand that these buildings were ver consistent and logical in the way they were designed and put together.

I'll certainly try to get a hold of the framing sheets but they're not critical in terms of being able to reproduce the building accurately.