Design of Steel Structure
The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of(where, t = the web thickness in mm h = the outstand of stiffener in mm)

125 t2/h
175 t2/h
125 t3/h2
75 t2/h

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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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