Floating column
Floating column
(OP)
floating columns should be provided or not if grid changes between floors?
what should be the criteria?
what should be the criteria?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Floating column
RE: Floating column
RE: Floating column
Guessing, are you talking about a column that is transferred out over a transfer beam to two other columns, so that it does not exist below the transfer beam, and is, in a sense "floating"?
Mike McCann
McCann Engineering
RE: Floating column
RE: Floating column
RE: Floating column
Mike McCann
McCann Engineering
RE: Floating column
RE: Floating column
And by eccentricity, I assume you mean either torsion on the transfer beam, or a bending moment to the columns below via a vertical misalignment?
Maybe I do not understand your problem here. Can you post a sketch?
Mike McCann
McCann Engineering
RE: Floating column
RE: Floating column
RE: Floating column
back to your original question, yes you need to get the architect to specifically state column location on their drawings. If you have problems getting to do this in a timely manner then you need to send them an email stating that this is delaying the design process and copy in the project manager/client.
As far as analysis is concerned, the column is often assumed pinnned at the base and is therefore taken as a point load on the transfer beam. Be aware that if you dont include the beam in the analysis then the sag of the beam will change the actual moments e.t.c. compared to a rigid fixed support, particularly if some of the columns have other columns under them.
So it is better to analyse the whole frame at once if you can.
One thing that has not been asked, is this in a seismic region?