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

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

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Design of Steel Structure
The elastic strain for steel is about

1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain
1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain
1/12 of strain at the initiation of strain hardening and 1/200 of maximum strain

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