The OpenSees Community

vesna wrote:
> In case you need chord rotation, the recorder is basicDeformation
>
> Check out this OpenSees webinar on FBE:
> http://opensees.berkeley.edu/wiki/index ... ed_Element
> If you go over it carefully you will see how FBE calculates basic
> deformation given the curvature.

Dear vesna
i want to know how OpenSees caculating the basicDeformation, integrating the curvature to the rotation Or just using (nodeRotation-ChordRotation).
And could u tell me in which folder/file of source codes from SVN i can find the formula of caculating the basicDeformation.

yes, it once had the damage recorder, but after the vision 1.6 it could not be used because the student charged for it never documented it. If you want you can use the old verison

vesna wrote:
> First of all I do not think that beamWithHinges is the right one to be used
> to model the links.
>
> The recorder argument that you have to use to get plastic hinge rotations
> of your nonlinear beam-column elements is plasticDeformation.

I want to know exactly what rotation the plasticDeformation records. You once said that the basicDeformation recordes two rotations of two element ends, from chord rotation to tangent rotation. I think the rotations maybe reflect the situation of the deformation but sometimes it's meaningless. For example, a beam with two rigid ends,under the gravity loads, it may occur plastic rotation in the ends, but the chord rotation is 0 and the tangent rotation is 0 too, so the basicDeformation is 0. May I think the plastic rotation is 0? Thus, if that's right, the recorder would make no sense. And i tried a test, for a beam, the stress of right end has been inlinear and the left end just linear.However the two rotations of plasticDeformation are almost the same ,why ?

just "wipe" after the analysis and before you post process