two ways to get moment curvature curve

[2015James]

hi everyone

i used nonlinear beam elements to model a frame, i want to get the moment curvature of a column. i think there are two ways to get the moment and curvature

1 recorder the section(integration point) force and deformation of the column, i can get the moment and curvature, respectively.
2 use the zeroLengthSection (in the moment curvature example on basic examples web page) to get the moment and curvature , respectively.

i want to know is there any difference in the two method?

thank you in advance.

[fmk]

option 2 gives a moment-rotation, which is not same as moment-curvature you would be getting from element sections.

[yangyankai]

fmk wrote:
> option 2 gives a moment-rotation, which is not same as moment-curvature you
> would be getting from element sections.

I have the same question. how the curve can be got of zerolengthsection element?
Thank you.