I usually model my columns as one end bending moment released and the other end fixed. The fixed end is the top of the column where at least one beam frames in at each orthogonal direction of the column. The bending moment released end is at the bottom of my column which the column is welded to the base plate and four anchor bolts attached to the base plate by nuts and washers ( ie. no stiffeners). Is this how others model their columns? I just started thinking that at the bottom of the column would be somewhere between fixed and bending moment released so I have not been conservative in previous designs neglecting some moments. I appreciate any comments or feedback on how others model columns!
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