Design of Steel Structure
The allowable shear stress in the web of mild steel beams decreases with (where ‘h’ is height and t is thickness)

increase in height
increase in h/t ratio
decrease in h/t ratio
decrease in thickness

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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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