Re: Gauss point visualization during post processing

[ryancwl95]

Hi,

I am currently using STKO as a post-processor for my model, which involves a pile embedded in soil. For the pile material, I am utilizing SSPbrick elements, while I am employing SSPbrickup elements for the soil material. I am using PDMY02 (PressureDependMultiYield02 Material) soil material for the soil and Elastic isotropic for the pile elements.

I am trying to visualize the stress distribution in my model, particularly in the soil. When I use the surface color map plot, I can see the stress distribution in the soil due to the gravitational load from the pile.

Screenshot 2024-12-18 225833.png (231.5 KiB) Viewed 3334 times

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These are the relevant results options for the surface colour map plot.

Screenshot 2024-12-18 230417.png (12.27 KiB) Viewed 3334 times

However, when I switch to the Gauss point plot to select the Gauss points for the relevant chart, I cannot see any Gauss points in the soil elements. The only Gauss points visible are for the stresses in the pile.

Screenshot 2024-12-18 225838.png (196.97 KiB) Viewed 3334 times

This is the relevant results options for the Gaussian point plot.

Screenshot 2024-12-18 230227.png (9.07 KiB) Viewed 3334 times

I believe this is related to the recorder objects I selected for the MPCO objects.

These are the objects:
recorder mpco "C:/OpenSees3.5.0/bin/%s/%s_recorders1.mpco"
-N "displacement" "velocity" "acceleration" "reactionForce" "reactionForceIncludingInertia" "pressure"
-E "force" "deformation" "localForce" "equivalentPlasticStrain"
-E "material.stress" "material.strain" "material.pressure" "material.cw" "material.equivalentPlasticStrain"
-E "strain" "stress" "tangent"

Do I need a different type of "object" in the object recorders to view the Gauss points of soil since I am using PDMY02 material?

[STKO Team]

You have 2 stress results, the second one (the one with 7 components) refers to the PDMY2 material which puts an extra variable (the 7th one) at the end of the stress tensor components

[ryancwl95]

When I attempted to use the Gauss point plot to select the relevant Gauss points for plotting the appropriate graphs, I found that none of the Gauss points associated with the soil were displayed in the plot. The only Gauss point that had stress data in the Gauss point plot originated from the pile material, which is linear elastic.

The results of the second stress results (the one with seven components) can only be viewed on the surface colour plot and not in the Gauss point plot. Is there any way to visualize these results in the form of the Gauss point plot instead of the surface colour plot?

[ryancwl95]

hello,
I was wondering if there are any updates on this matter?
Sincerely,
RYan

[aziz_barzuk]

Hello,
I had the same problem with the SSPquadUP and SSPbrickUP.
With the 20_8_brickUP this problem is limited to some element also with an error about a missing record in the database.
I wanted to ask kindly if there is a turnaround that can overcome the manual way to extract the result from the element directly with code.

[STKO Team]

Unfortunately this happens when SSPBrick elements (with 1 integration point) is used in combination with PDMY materials (that do not write enough information in the output as all other materials/elements).

We will try to modify the code in OpenSees for those materials/elements.
In the meantime the solution is to create 2 recorders, one for only the geometries with SSP elements + PDMY materials and the other with the remaining model.
You can do it using region command and put them in the MPCO recorder

[ryancwl95]

Got it, Thank you!

[STKO Team]

You're welcome