how to record nodal stress

Alexzhou · Post by **Alexzhou** » Mon Feb 13, 2006 11:07 pm

The element stresses and gauss point stresses can be recorded in OpenSees easily. But when I was thinking to ouput the nodal stresses, I don't know how to do.

Has anyone done the nodal stress recording before? Any suggestion?

I think I knew the nodal stresses can be calculated by certain projection or averaging methods. Is there any method for computing the nodal stresses that is implemented in OpenSees?

silvia · Post by **silvia** » Tue Feb 14, 2006 5:32 am

you can record stresses and strains on fibers in sections, please see element recorder documentation.
Afterall, there isn't just one stress at an integration point.

http://opensees.berkeley.edu/OpenSees/m ... index.html

Alexzhou · Post by **Alexzhou** » Tue Feb 14, 2006 2:53 pm

I did analyses of solids using only the Brick element, and no fibers of section are involved.
My primary interest now is to ouput the nodal stress for post-processing. For example, if knowing the stress on the nodes, I can easily generate smooth stress plot in Tecpot.
I hope what I said is clear enough. Any more suggestions?

silvia · Post by **silvia** » Tue Feb 14, 2006 3:53 pm

that's one for Boris, then

Gang Wang · Post by **Gang Wang** » Tue Feb 28, 2006 5:50 pm

as far as I checked the code today, the answer is no.
One has code a little bit to use shape function to project Gaussian point values to nodal values and modify function, eg. getResponse() etc., accordingly for that element. Not sure who is going to do that.

Alexzhou · Post by **Alexzhou** » Thu Mar 02, 2006 4:50 pm

I wish I could have time to do a simple least square projection. But if I do need it later, I think I will code it and let you guys know.