Structural Analysis
To generate the j th column of the flexibility matrix

a unit force is applied at coordinate j and the forces are calculated at all coordinates
a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates
a unit force is applied at coordinate j and the displacements are calculated at all coordinates
a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates

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Structural Analysis
Pick up the correct statement for the web stiffeners.

d is the distance between flange angles or the clear distance between flanges
Vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d
All of these
For horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange

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