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Hi jhardy1, Thank you so much! This really helps. Kind Regards, Ryan

Hi jhardy1, Thank you for your reply. What would happen if the mesh is now uniformly distributed? Will it generate unintended stresses or forces? I tried it again. First cleaned the geometry, then manually created the plate elements connecting the vertices. And it yields to a much simpler...

And here is the IGES file.https://files.engineering.com/getfile.aspx?folder=caf0e86b-0afb-47ed-ab65-b2876bf10571&file=111_Shell_A2.igs

Hi guys, Thank you so much for your suggestions. Yes, I used Strand 7 auto-surface meshing tool to construct the mesh. This is not the original Sydney Opera House roof but a simpler geometry generated by form-finding tools in Grasshopper. Therefore, I don't actually have mathematical...

Hi jhardy1, Thank you so much for your kind advice. You are such a kind person! My geometry was generated by Grasshopper and its mesh was quadrilateral in Rhinoceros. After I imported the IGES file into Strand 7, I re-meshed it with 6-node triangle. I have fixed the problems of different...

Hi jhardy1, Thank you so much for your advice. I have selected all the plates and assigned all of them to 6-node triangles. But I don't know why there are still other types of plates. I have cleaned the mesh and may I ask does it automatically deleted the overlain plates? As for the problem...

Hi Doug, Thanks for your kind reply. I think the problem is about the selection of the plate type. And selecting plate/shell element would have six degrees of freedom automatically. Also, may I ask what do you mean by experimenting a smaller model? Should I choose Tri3 or Quad4 plate rather...

Hi, May I ask if someone knows how to edit the degrees of freedom for each node in Strand 7? I have built a thin 3-D shell structure in Strand 7 which is ready for static analysis. And I adopted Tri6 plate to mesh the surface. The default freedom condition is set to all free condition, which...

Hi Mohanlal0488, Yes, I did. Thank you so much for your advice. Ryan

Yes, it's one of the shell roofs of Sydney Opera House.

Hi Goug, Thank you so much! The problem has been solved now.[dazed] Kind Regards, Ryan

Hi Doug, I have attached the .st7 file, but have no idea why the link is connected to the .lsl file. Here is the Google Drive link for the .st7 file(https://drive.google.com/file/d/1_0ah_ajULjpjFJeNkC4GQw-Jrk4fLfgR/view?usp=sharing). Could you please have a look at the .st7 file? Thanks, Ryan

Hi Doug, Thanks for replying my post. Yes, I have defined material properties and node restraints. Basically, I have defined the fixed bottom supports and a hinge support at one side of the shell, and left all other nodes unchanged. The link to my ST7 is attached to my original post, could you...

Hi, Does anyone know how to solve the problem of "Global stiffness matrix is singular"? I have a shell structure built in Rhinoceros and imported into Strand 7. After conducting surface automeshing, I have applied the plate thickness as 400mm and defined the fixed supports. However, when I run...

I am a beginner of Strand 7, and I am trying to import a shell geometry that is modelled in Rhinoceros. Does any one know how to edit the model in Strand 7 and run it? I try to do this myself, and it keeps saying there is no nodes in the model. Kind Regards, Ryan