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whammy123

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## Homework Statement

Can somebody please explain me:

What does it mean that Longitudinal Stiffness (EA) is equal to infinity? What does it change if for some members of a structure "EA = infinity", and for other members "EA = finite number".

## Homework Equations

I know that we use longitudinal stiffnes to calculate displacement, by Maxwell - Mohr Formula: fi = sum of integrals [N*Ń/EA dS], but what meaning has the infinity or precise value of Longitudinal Stiffness?