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Flexibility and Stiffness

Lecture Presented on 06 February 1997


For more further information on this topic, please see the laboratory handout titled "Flexibility and Stiffness of a Portal Frame".


here P1, P2, P3 and D1, D2, D3 are the forces and displacements of points 1, 2, and 3, respectively.

If:

P1 = 1.0

P2 = P3 = 0.0

Then:

f11 = D1

f21 = D2

f31 = D3

P2 = 1.0

P1 = P3 = 0.0

and:

P3 = 1.0

P1 = P2 = 0.0

These results can be used to construct the second and third columns of the flexibility matrix.

where:

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