Structural Analysis
Principle of superposition is applicable when

Material obeys Hooke's law
The action of applied forces will be affected by small deformations of the structure
None of these
Deflections are linear functions of applied forces

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

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
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

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