a strange problem when trying to perform a three-dimensional microscopic modeling of masonry structure.

[xgx]

Dear STKO team, I encountered a strange problem when trying to perform a three-dimensional microscopic modeling of masonry structure. However, when I conducted a gravity analysis on one wall alone, the analysis proceeded normally and there were no issues. However, when I merged several walls to create a masonry house, I encountered the error in the following image. I really don't understand why. The boundary conditions are set as shown in the figure below, and I don't think there is any problem. This question has been bothering me for several days, and I would greatly appreciate it if you could answer it for me.

[STKO Team]

If you see the line "Warning: numeric analysis returns -1" it means that your model is singular.
From what I can see from the image, your slab is not attached to the walls

[xgx]

If you see the line "Warning: numeric analysis returns -1" it means that your model is singular.
From what I can see from the image, your slab is not attached to the walls

Dear STKO team:
Thanks for your reply, but it seems that you misunderstood what I want to express. In fact, I have merged the slab and wall, but I accidentally set the shader color of the slab to red, which caused you to misunderstand. Even if I removed the slab, only four walls remained, merged them, fixed the bottom, and ran the analysis, the program still reported this error. This really troubles me. I have attached my SCD file. Could you please help me check it.

[xgx]

If you see the line "Warning: numeric analysis returns -1" it means that your model is singular.
From what I can see from the image, your slab is not attached to the walls

Dear STKO team:
Thanks for your reply, but it seems that you misunderstood what I want to express. In fact, I have merged the slab and wall, but I accidentally set the shader color of the slab to red, which caused you to misunderstand. Even if I removed the slab, only four walls remained, merged them, fixed the bottom, and ran the analysis, the program still reported this error. This really troubles me. I have attached my SCD file. Could you please help me check it.

At present, what I can confirm is that all the walls have been merged into a masonry structure. I fixed the bottom of this structure and conducted gravity analysis, but still encountered the error of singularity in the stiffness matrix. Because of this, I really don't understand why. I sincerely desire for your reply.

[STKO Team]

It runs in my case.
Probably your model is too large (too many DOFs) for a single processor.
Try using parallel analysis with OpenSeesMP

[xgx]

It runs in my case.
Probably your model is too large (too many DOFs) for a single processor.
Try using parallel analysis with OpenSeesMP

Thank you for your advice, however, I tried to do as you said, but it doesn't work.

[xgx]

It runs in my case.
Probably your model is too large (too many DOFs) for a single processor.
Try using parallel analysis with OpenSeesMP

Thank you for your advice, however, I tried to do as you said, but it doesn't work.

So, the reason for this issue is actually due to insufficient performance of my computer?

[xgx]

It runs in my case.
Probably your model is too large (too many DOFs) for a single processor.
Try using parallel analysis with OpenSeesMP

Thank you for your advice, however, I tried to do as you said, but it doesn't work.

So, the reason for this issue is actually due to insufficient performance of my computer?

Thank you very much, your suggestion inspired me. After increasing the grid and reducing the number of grids, it can run normally.

[STKO Team]

You're welcome