×
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

Different flat slab thickness

Different flat slab thickness

Different flat slab thickness

(OP)
Greetings to all,
I am currently doing a design for a G+Mezanine+3floors+roof. Here I am using flat slab as the its a multi purpose building so the wall to wall doesn't match. Ground 7 mezzanine floors have lots of vacant space were as 1st to 3rd floors are accommodation. so there are brick wall etc. So more load is coming in level 1st to 3rd. More thickness shall be considered for 1st to 3rd floor. I am considering 250mm thick slab for mezzanine, 290mm thick slab for 1st to 3rd. Intermediate columns also present. Is it ok if I consider lesser thickness for the mezzanine floor and greater thickness for 1st to 3rd.
Need your advise. Guys please help me out.

Firoz

RE: Different flat slab thickness

Lesser thickness is ok if it works for the design, and meets code requirements

RE: Different flat slab thickness

Don't change your thickness without checking with the archtitect. you know for a fact their going to find some stupid reason it's an issue for them even if you get the top of floor elevation to match.

RE: Different flat slab thickness

(OP)
Thank you guys for your suggestions. Can you tell which code to refer and where. just wanna be on the safer side.

RE: Different flat slab thickness

i dont think there is a specific code clause that deals with different thinkness's vertically in a building. as long as this dosnt create a soft storey than i can see no reason why normal analysis of the earthquake design wouldnt suffice.

http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

RE: Different flat slab thickness

Weigh the benefits of keeping the slab thickness the same for simplicity of construction vs. material savings. It is not always prudent to design to the gnat's posterior if it makes life more difficult for the contractor.

RE: Different flat slab thickness

FZHSK
You state 'mezzanine floors have lots of vacant space'. Designing for loading dictated by a specified use is acceptable, but it's likely that current vacant space will end up as used space sometime in the future.
A reasonable imposed load must be allowed for, but I would ask the architect/client for an specific requirements re future-proofing.

RE: Different flat slab thickness

Ask a concrete contractor which is more cost effective. The might surprise you with their insight.

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