2nd Floor Concrete Slab

 
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Old 07-08-2012, 01:58 PM   #1
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2nd Floor Concrete Slab


I am constructing a 10 unit 2 story condo building with concrete block and 10in. square poured concrete beams and columns. I have 10 in. square columns and concrete block wall supporting 10in beams @ 12ft on centers front to back. I have 3" x 6" X 16ft treated wood beams @ 3ft on center between the columns front to back for a clear span of approx 15 ft. Above the 3 x 6 beams is nailed in place tongue and grove 3/4" planking which will be a stained ceiling below and support for the 4 " concrete floor above. Whew!! My question is what should the rebar size and spacing be??
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Old 07-08-2012, 02:10 PM   #2
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Re: 2nd Floor Concrete Slab


You're kidding, right...?

Multi story, concrete?

No notes on the plans...

Sounds to me like you are in a foreign country...

that requires minimal or no plans ^ no such thing as engineering.

Saw a lot of this in Mexico & Baja...

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Old 07-08-2012, 02:23 PM   #3
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Re: 2nd Floor Concrete Slab


Good luck with that one
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Old 07-08-2012, 03:54 PM   #4
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Re: 2nd Floor Concrete Slab


#9 both ways, 2" o.c.
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Old 07-08-2012, 04:47 PM   #5
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Re: 2nd Floor Concrete Slab


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#9 both ways, 2" o.c.


That's damn funny there.

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Old 07-08-2012, 05:59 PM   #6
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Re: 2nd Floor Concrete Slab


KMR
– Request for Information:


Ques. #1
Is the T&G Planking on-top or below, it was unclear.
Above or below the 3”x6” Wood Beam?



Ques. #2
Is it regulation in your area to have 4” Concrete topping? With the ” T&G Planking? If there is a subfloor, it should be okay with 1-1/2” or 1” topping. What location are you designing for?


Ques. #3
Can you elaborate in more detail as to:
the Foundation system, then,

the Level 1 floor system, then,
the Level 1 wall system (supporting Level 2 above), then,

the Level 2 floor system, then,
the Level 2 wall system (supporting Roof over-head), then,

the Roof assembly (flat-roof? Sloped roof?)

These questions will help, us, determine loadings on your floor.
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Old 07-09-2012, 01:47 PM   #7
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Re: 2nd Floor Concrete Slab


Not sure which municipality is applicable - but I suspect this would require a PE seal for a 2-story reinforced concrete structure. If so, the plans would be deficient if these details weren't called out. I wouldn't take the responsibility that doesn't - and can't (unless you're a PE) reside with you.

How is the slab integrated with the structure? No shear studs or similar? Again - consult the licensed engineer of record - but a steel decking could be used over the 3/4" T&G. The Steel Deck Institute has several publications guiding the design of steel decking concrete floor systems.
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Old 07-12-2012, 01:45 PM   #8
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Re: 2nd Floor Concrete Slab


Id totally just wing something like that. You might wind up getting bad advice off the internet.
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Old 07-13-2012, 04:49 PM   #9
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Re: 2nd Floor Concrete Slab


Quote:
Originally Posted by Rockmonster View Post
#9 both ways, 2" o.c.
only if if you use #7 stone in the mix (ACI 318-3.3.2)
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Old 07-14-2012, 12:33 PM   #10
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Re: 2nd Floor Concrete Slab


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only if if you use #7 stone in the mix (ACI 318-3.3.2)


Just off the top of my head...# 7 is three inch right? Did I win?
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Old 07-15-2012, 08:32 PM   #11
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Re: 2nd Floor Concrete Slab


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Originally Posted by mrcharles View Post
Just off the top of my head...# 7 is three inch right? Did I win?
You lose #7 stone is 1/4" -1/2" in size. When designing a mix you need to take in account the rebar spacing & the distance from the bottom of the form to the bottom of rebar. The stone should not be bigger than 3/4 of the spacing & not bigger than 1/5 of the distance from the bottom of the form to the bottom of rebar, but exceptions can be made.
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Old 07-16-2012, 02:18 PM   #12
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Re: 2nd Floor Concrete Slab


I lose.... I was thinking CA-1 that is 3"

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