Structural Analysis
Independent displacement components at each joint of a rigid-jointed plane frame are

one linear movement and two rotations
three rotations
two linear movements and one rotation
three linear movements

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

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

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