Staad.Pro. Elements material loss in a large models. Solved

romkeris,

140000 elements is too many. While you may be able to analyze this model, it is unlikely that you will be able to view the results in the Post-processing mode. The results data is likely to exceed the limits that exist on many Windows operating systems for 32-bit programs.

You should look at reducing the number of elements. More than around 20000 is not advisable in our opinion from the standpoint of managing the amount of results data. For the slabs, in any closed panel (surrounded by beams on all sides), around 8 elements per side would be enough to get reasonably accurate member forces, support reactions and nodal displacements.

As for the problem of material data being "lost" for very large models, the next build of STAAD which is due to be released in a few weeks will have the correction.

 

 

You can run this model by using the editor and not saving from the main STAAD menu.

The file seems slightly corrupted. Add the line STAAD SPACE before the first line. Delete "vi" from beginning of next line. Then add to the plate thickness data to include all plates.

If you are using the Advanced solver the run time should be about 30 minutes depending on the computer. A small number of load cases will run quickly through the plate results. However a large number of cases, especially Load Combination cases could take a very long time.

I added STAAD SPACE, but didn't find "vi" in the next line. Assigned thickness and concrete material to all plates using editor. Cut model by half - now it contains 80237 elements, but then I run the analysis, Staad reports errors about plates without elasticity again...

Can you try to run my updated model. Maybe it's just like Surojit said, model contains too many plates and that would be fixed in the next build of Staad. I will try to reduce the number of plates then.

Thanks

Unknown said:

romkeris,

140000 elements is too many. While you may be able to analyze this model, it is unlikely that you will be able to view the results in the Post-processing mode. The results data is likely to exceed the limits that exist on many Windows operating systems for 32-bit programs.

You should look at reducing the number of elements. More than around 20000 is not advisable in our opinion from the standpoint of managing the amount of results data. For the slabs, in any closed panel (surrounded by beams on all sides), around 8 elements per side would be enough to get reasonably accurate member forces, support reactions and nodal displacements.

As for the problem of material data being "lost" for very large models, the next build of STAAD which is due to be released in a few weeks will have the correction.

 

I found a solution to calculate large models. I don't know, if you knew and didn't tell me :), but all I had to do, is to create multiple concrete materials (the same concrete characteristics, but different name of material) and assign these materials to different elements. In such way reducing the number of elements assigned to one material. Of course it's not convenient way, but easier than to remake whole model.

Staad that model run just for half an hour, so it's not a problem.