Design of Steel Structure
The statical method of plastic analysis satisfies

equilibrium and mechanism conditions
equilibrium and plastic moment conditions
mechanism and plastic moment conditions
equilibrium condition 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 about 1/120 of maximum strain
1/12 of strain at the initiation of strain hardening and 1/200 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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