Minimum Composite Deck Thickness
Minimum Composite Deck Thickness
(OP)
Just looking for a rule of thumb for a typical 100psf corridor commercial application. What is the minimum concrete thickness above the deck you like to use? When there's only 2" of concrete above the flutes I kinda get worried because I've been told by other engineers not to go below 2 1/2". Wondering if it is a valid point. Obviously Vulcraft isnt going to list a product that wont work, but.....






RE: Minimum Composite Deck Thickness
RE: Minimum Composite Deck Thickness
RE: Minimum Composite Deck Thickness
RE: Minimum Composite Deck Thickness
One question: Is stud length of 1 1/2" minimum above the top of deck required by code?
RE: Minimum Composite Deck Thickness
Also, total slab thickness shall not be less than 2" above the top of the deck. I.5.1.5.
RE: Minimum Composite Deck Thickness
RE: Minimum Composite Deck Thickness
I agree. I was giving the code miminums above (at least the AISC minimums). In the absence of a required fire rating, I usually use 3" above the deck, just for that reason, and vibration control.
RE: Minimum Composite Deck Thickness
Another reason to use a thicker concrete is for installation of expansion anchors at hanger supports. Many product ICC reports require 3 1/4" minimum over deck.
RE: Minimum Composite Deck Thickness
RE: Minimum Composite Deck Thickness
IMHO, it is should be acceptable to design steel beams and girders as non-composite if that fits the particular application better. A local steel erector has told me that if you have approximately 500 or less studs on a job, the savings in steel using compsite action probably does not pay for bringing in the stud welder machine, getting it calibrated for the job, and having the special inspector doing ring and bend tests. So, for small buildings, we tend to go with non-composite beams if we can.
Good point about the expansion anchors, though be carefull of expansion anchors in an overhead application.
Loui1: Good question. I've always checked the entire 'system' ( beams, girders, deck, etc). Never the indivual elements.
RE: Minimum Composite Deck Thickness