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

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

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Design of Steel Structure
The mechanism method and the statical method give

upper and lower bounds respectively on the strength of structure
lower and upper bounds respectively on the strength of structure
lower bound on the strength of structure
upper bound on the strength of structure

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Design of Steel Structure
The bracing between two columns of a steel tank will be designed to resist

horizontal, shear due to wind or earthquake + 2.5% of column loads
column loads + full horizontal shear due to wind or earthquake
horizontal shear due to wind or earthquake only
column loads + 2.5% of horizontal shear due to wind or earthquake

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