Design of Steel Structure
According to IS Specifications, the maximum pitch of rivets in compression is (where t is thickness of thinnest outside plate or angle)

lesser of 3 00 mm and 24 t
lesser of 300 mm and 32 t
lesser of 200 mm and 161
lesser of 200 mm and 12 t

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

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

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