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sowmya
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Join Date: Jan 2012
Posts: 5

Floating Columns

05/13/2013 11:59 AM

Dear All,

I have recently designed a residential building ,G+3 floors, in ground floor there are 13 columns, in first floor i need to construct 2 columns that are floating columns instead of 1 column, that means the no of columns in the first floor becomes 14. Is there any rule for floating columns that if i give one column in the below floor, i have to compulsorily give 2 columns in the above floor to balance the weight of one column, or distance for floating columns or is there any structural rule for floating columns. Please give me information on floating columns.

Thanks,

Sowmya
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Pathfinder Tags: Civil structural design
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passingtongreen
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#1

Re: Floating columns

05/13/2013 12:44 PM

You don't say where you are, or what you mean by designed, your question indicates you are not a structural engineer. Unless a local code says different, this is my answer.

I think you you should not call them "floating", it gives the wrong impression, we like our columns to stand firm. You need "transfer beams" or "transfer girders" to provide the loadpath from the upper columns to the offset lower columns. These transfer beams and girders will be stronger, probably deeper than the others. I know of no restriction as long as the structure, as designed and constructed, provides loadpaths for all of the loads.

You need a Professional structural engineer to size your particular structure.

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Fredski
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#3
In reply to #1

Re: Floating columns

05/13/2013 5:17 PM

I recall reading back in the old days of Rome that bridge and arch designers were required to stand beneath their designs as the construction scaffolding was dismantled....
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lyn
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#2

Re: Floating Columns

05/13/2013 12:59 PM

That's not much to go on.

Floating column - Structural Analysis and Design Forum ...
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dvmdsc
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#4

Re: Floating Columns

05/13/2013 9:59 PM

When you move columns, you need to make sure that the load pattern is adequately spread through your material the column stands on. With columns on a floor also positive and negative loads occurs that have to be calculated for in the strength and position of the reinforcement in your concrete.

But I guess you are talking about wooden or styrofoam columns, because they are floating?

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CaptMoosie
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#5

Re: Floating Columns

05/14/2013 7:30 AM

I am echoing Passingtongreen's sentiments entirely. Hire a Licensed Structural Engineer to design this building, regardless of where you are!

And I'm not touching this one with a 10-foot pole either. Obviously, the OP hasn't a clue, which is dangerous and will eventually lead to a loss of property and life.

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Yusef1
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#6

Re: Floating Columns

05/14/2013 8:51 AM

We have all seen it.

You wont' get anybody here to comment favorably on your plan, or even to comment at all.

Codes are notoriously silent on the subject.

You might chat with this fellow. Check out his blog. His name is Seva Nanda Kishorre, he runs a civil engineering blog, and he seems to be familar with civil codes in his area. He notes the code in his area does not cover floating columns. He doesn't like them either.

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passingtongreen
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#7
In reply to #6

Re: Floating Columns

05/14/2013 9:39 AM

I don't know why the codes should say anything about them. To a competent structural designer it is just another wrinkle. Such columns may be included in the wind and lateral earthquake resistance or not as long as the stiffnesses and connections are compliant with the assumption. We don't go into a tiswas over partial floors, so why this.

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MR. Guest
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#8

Re: Floating Columns

05/15/2013 11:19 PM

How about providing a (sketch/diagram/picture/other) to clarify the kind of structural situation you are actually talking about?...

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CaptMoosie (1); dvmdsc (1); Fredski (1); lyn (1); MR. Guest (1); passingtongreen (2); Yusef1 (1)

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