Pentagon-- the need for Steel re-rod, or expansion joints during original

contruction

excuse if the is a dupe--
This link was left at another thread but It doesnt load right now-- irregardless--

http://fire.nist.gov/bfrlpubs/build03/PDF/b03017.pdf

more importantly--

I think one might want to examine the need or requirements, by building code, for expansion joints - or the lack of expansion joints - in the 1940s -- or when ever the Pentagon was built-----



Here in the North East there are plenty of 50 to 100 year old concrete stuctures, from a couple of hundred feet long to 1000 or maybe 1200 feet long, not one with expansion joints. Steel re-inforced concrete has been a staple in construction for at least 100 years. I'm not talking about bridges here-- Im refering to factories and sky scrapers.

Currently some, new construction is done with a steel frame and a "hung facade", of pre- fab masonary sections. These do include expansion joints.

Of course the thought that an expansion joint was there at the left part of that famous picture-- explains why there was no steel re-rod sticking from the left side break.

Buildings of that era were built monolithic as far I know. I'd like to see the original specs- and building code from that era.

If I am right, there should have been steel re-rod sticking from all those wall & Floor sections. There is none----

My guess is that expanion joints were not reqiured by building code at the time of the Pentagons construction.

Any thoughts?