Slab Design Rule of Thumb

[jmp02t]

What is a good rule of thumb when doing schematic designs of an elevated/mezzanine floor? I'm looking for a general reference on thicknesses, not rebar sizing.

For example, I'm designing a mezzanine with light storage loading, supported by steel beams at 5' o.c. and metal deck.

 

[a2mfk]

You mean so you can look smart at meetings with architects? I love being able to do that too. But seriously, looking up what you just gave us in a vulcraft or similar manual would only take about 2 minutes...

 

[msquared48]

1.5" deep B deck with a 2.5" topping or something similar should work, but check the tables from Vulcraft as previously suggested for the loading you need.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[abusementpark]

For a reinforced concrete flat slab, I think a good rule of thumbs is 1/3-1/2" of concrete thickness per foot of span for typical floor loading.

I'm not sure about slab on metal deck.

 

[dik]

2-1/2" topping on 1-1/2" deck is good for about 6.5' supported on steel beams. Use 20 ga deck and not 22 ga. and make sure the side lap seams are well secured.

Dik

 

[dik]

Should have added that the deck is 3 span cont...

Dik

 

[csd72]

this one is based on uk practice but is relevant for US:

http://www.concretecentre.com/default.aspx?page=878

Also structural engineers pocket book.

If you know anyone who works for ARup they have a good manual that is based on the above.

Or just google preliminary design or scheme design.

I would also suggest using the google search at the top of the page as this topic has come up before.

 

[BAretired]

According to the Canam Steel Deck catalog, a 3.5" slab thickness with 22 ga. composite steel deck will carry a factored load of 420 psf on a 5' span. Personally, I have always used a 4" minimum slab thickness (1.5" + 2.5") but that is a matter of personal preference.

Dik, when you say minimum 20 ga. and not 22 ga. deck, are you referring to a composite or non-composite deck? If both, what is your reason for selecting the heavier gauge?

BA