Is it possible to add Timoshenko stifness matrix ?

[AntoineC4Ci]

Hello,

First of all, thank you for your work !!

I analysed quited deeply the sourcre code, and noticed that sections have the "GA", "Ay" and "Az" properties, that are actually not used.
Indeed, these properties are commonly used to consider the shear deformation of a beam element, while Bernouilli assumptions only consider bending.

Is it possible to proper add the shear deformation to this FE library ? a good approach could be to add an input boolean, to activate or deactivate (default) the shear deformation, so the current tests remain validated.

If I am correct, it would require to modify
1- the local stiffness matrix of an element
2- the postprocess to get the local forces and displacements at x (I guess the formula should change, as we asume that we do not have pure bending anymore within each segment).

What do you think ?

Regards

[SaMohamed]

Thank you Antoine

When i made the section class, i left these proprieties for future improvement.
if we consider shear deformation, these properties will ne affected:
1- the stiffness matrix for the element and subsequently the stiffness matrix for different end release cases.
2- the scape function.
3- end forces calculations to add shear deformation factor.

[AntoineC4Ci]

1- the stiffness matrix will indeed be affected.
If i am right, this should look like this :

3- I did not look into this. But I do not get how an additoonal shear deformation implies different end forces. I admit that I am quite a newbie in FEM analysis. I basically learnt from your code + external documenttion. While we have plenty of these documenation for bernouilly analysis, the shear deformation is barely taken into account. I would apreciate if you have any documention to help me undestand.

Regards