Design of Steel Structure
The effective length of a fillet weld should not be less than

Weld size
Four times the weld size
Six times the weld size
Two times the weld size

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

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
lower bound on the strength of structure

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