Beam Plastic Constitutive Models Integration Planes


I have two questions about the beam plastic constitutive models.

  1. What is the rule of distribution for “integration planes” throughout the beam ?

For instance, when we write nx=3, we know that there are three planes at which integrations are made throughout the beam. However, we don’t know the exact locations of these planes.

  1. Circular sections have radial distributions for integration points. The numbers of n(theta) can be 7,9 and 11. Since those are odd numbers, there would not be symmetrical distribution within the section. It may cause unsymmetrical response for a perfectly symmetrical pile section. The question is: where is the starting point of integration point radial line? It starts from y (local) axis or z (local) axis ? What is the rotating direction?

My reply is in the form of a slide set (PDF file).

supportQuestionPlasticBeams.pdf (507.4 KB)

Thank you very much for your reply. Could you send me “Potyondy (2022)” document please?
My e-mail:

I have sent you the requested technical memo.

Thank you Dr. Potyondy.