Design of Steel Structure
A circular column section is generally not used in actual practice because

it is difficult to connect beams to the round sections
it cannot carry the load safely
it is uneconomical
All of these

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Design of Steel Structure
In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate

75% by direct bearing and 25% through fastenings
Fully through fastenings
50% by direct bearing and 50% through fastenings
Fully by direct bearing

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