huangyhg

granco cofar slabs
i am currently engineering upgrades for a building (1960 vintage) which used granco cofar concrete slabs on metal deck throughout. the designations look like 5-1/4c24. my first question for anyone is are there still load tables available for this deck? the company went out of business in the late 60's.
simple calculations based on the sdi manual trying to determine the maximum allowable unshored length yield about 5'-9", while my specific situation deals with spans between 10'-9" and 13'-0". with this info, i am assuming that the deck was shored. how would i go about calculating the allowable live load on this deck?
we are going through the same situation as you. cofar slabs - about 5 1/2" thick total - spanning between 10'-0" and 13'-0" in a parking garage - some deterioration - surface rusting on the bottom of the deck - concrete delamination, etc. some deck is almost all gone.
we've done some internet searches with little luck. the original engineer (whom i knew) is now deceased and his daughter told me that all his books and reference works are gone as far as they know.
so now there's two of us looking for help - c'mon eng-tippers, don't let us down!
i couldn't find any sort of catalog on the net. i couldn't find it in the library of congress as someone in the old thread below suggested. i did however find a thread about these decks on eng-tips.com. i found it through google. apparently it had been deleted or removed from eng-tips.com, but by searching google caches, i was able to resurrect this old thread. i think the best way to find this catalog is to email the people below who claim to have it. i went into this thread and added nospam in their emails (xxxnospam@xxxx) to ensure they don't get any spam when i repost this.
bootman (structural) mar 26, 2003
i'm evaluating a 1956 steel structure with a type of floor slab construction i'm not familiar with. record drawings read "4 1/2 inch concrete on 24 ga. cofar with type "g" t wire." negative reinforcement is called for at the beams but no positive reinforcement is indicated. spans are typically 10 feet. does anyone have any information on this system? any comment are appreciated.

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wsiladi (structural) apr 22, 2003
i researched cofar last year and found that this was an early propietary composite metal deck/concrete floor slab system (composite floor and reinforcing). a google search will bring you to the now defunct granite city steel company of granite city, illiniois as the producer of this product. a similar search will yield the national steel corp of granite city illinois as the new owner of the bankrupt company.
believe it or not, there is one facility engineer at national steel corp who has a complete catalog of cofar slabs and ratings. a web resource that claims to have either a copy of the catalog is:
was an e-mail available for 'mattman'? i have e-mailed 'windowpane' and 'goosehunter' but gotten no response.
i finally found someone who had a pdf copy of the catalog. i cannot upload the catalog to the eng-tips website, so anyone who is interested may e-mail me at:
rmalaska - i know nothing about granco cofar slabs, but if you will email the .pdf document to me at the address on my web page (link below), i'll post it for download by all. of course will list you as the contributor. (3.8 mb should be ok)
thank you, the file has been e-mailed for all to download.
slideruleera - let us know when you get it up for downloading.....
file is ready for downloading. it is located near the top of the home page. kudos to rmalaska.
slideruleera:
perhaps we set this up as an faq as well for future users? can you do that?
jae - good idea, i have "made it so" at

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