Design of Steel Structure
Diameter of a bolt hole is usually taken as

nominal diameter of bolt
nominal diameter + 1.5 mm
gross diameter of bolt
nominal diameter + 2.0 mm

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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

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

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