floating column

huangyhg

floating column
floating columns should be provided or not if grid changes between floors?
what should be the criteria?
excuse my ignorance, but what is a floating column?
that is column is not above column but erected from beam between two columns
i've never heard that term either.  
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
yes it is erected from the beam.
i would not call any column a "floating column".  if it is a vertical   
the grid location is your choice and that of the architect.  the vertical forces have to run to the foundation via the column/beam arrangement regardless of the gridlines chosen.  the positioning of the columns should come first per the structural and architectural requirements, then the gridline assignments.  don't put the cart before the horse here.
mike mccann
mccann engineering
i think earlier it was said that columns should not be eccentric but in this case there is not any column below new column so how one can analyze it?
if you have a transfer beam with columns at each end, where is the eccentricity?  
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
the column is a concentrated load on the beam which supports it.  not sure why you are asking.  how much load is on the column, and what is the beam span?  steel structure, concrete structure, or what?
we label these as stub columns.