×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Flat Slab

Flat Slab

Flat Slab

(OP)
Hello All,

Just to have a discussion regarding flat slab. What I understand of flat slab that it is supported by column instead of beams. So for the ground floor construction of flat slab, how is the arrangement of the reinforcement in flat slab? If there are perimeter beams around the flat slab, will the slab reinforcement still goes into the beams?

Furthermore, when I did a design for the flat slab at ground floor (but I ended up using solid slab instead) some told me that the slab reinforcement can be reduced as long as the ground is well compacted. They also said there is no need to worry much about the punching shear check from the column as the slab will lay on the ground. Only if the slab is at the first floor, or above, will it become critical.

Could someone explain this to me.

Thanks.

#LoveWins

RE: Flat Slab

It sounds as though you're struggling with the difference between a sub-base supported slab on grade and a suspended slab at grade. Which path are you taking and, if you're going with a suspended slab, what are your reasons for pursuing that strategy?

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Flat Slab

A slab supported (more or less) continuously on soil is not a flat slab, rather it is a slab on ground (aka, slab on grade.) The rules are entirely different and the design strategy is completely different. Also, depending upon soils and foundation type, designing a soil-supported slab as an integrally-connected, structural slab could compromise the structure when soils move.

RE: Flat Slab

(OP)
@KootK: It is a sub-base supported slab, and from what I read here, it is not called flat slab anymore and the way to design is totally different?

@TXStructural: Only now that I know it is called slab on grade. In what way is the design different? Oh it has to take consideration of the soil properties?

#LoveWins

RE: Flat Slab

Quote (drago8)

it is not called flat slab anymore and the way to design is totally different

Totally different. For one, your walls and columns will probably pass through openings in your grade supported slab as they extend down to their supporting foundations.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Flat Slab

(OP)
@KootK: This is totally new to me. Thank you! I will try to look for materials regarding this matter.

#LoveWins

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources