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

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

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

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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 1/200 of maximum strain
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

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