Steel Column Design

[radger49]

Is it possible that the steel column section on the upper floor is bigger than the steel column section on the lower floor? The building is irregular in shape, 7-storey with two cellars/basement, perimeter of the cellar is a concrete wall and columns, and other structures are steel columns and beams, with auto-select steel design, I encountered this, steel columns on 2nd floor is much bigger than the steel columns on the lower floors. And also, is there a way to incorporate CMU wall system in analysis using ETABS, could someone help me in this matter, thanks so much!

 

[slickdeals]

It could be because there is no column above to distribute the moment.

 

[radger49]

Thanks for your immediate reply, but then the column I mentioned has columns in its upper floors.