topic Re: Same loads - different results in Robot Structural Analysis Forum

Same loads - different results

cernevicius.karolis — Wed, 29 Mar 2023 22:45:26 GMT

I am doing some reinforcing work on columns and I've ran into an issue. I've got 3 columns with almost the same loads, but one of them has more than double the required reinforcement ratio for some reason. Material is the same, section is the same and overall, all parameters used are the same, but required reinforcement differs wildly. Anyone might know of what could be the issue? P.S. provided reinforcement tab works fine and this issue appears to be in required reinforcement tab only.

Re: Same loads - different results

Romanich — Thu, 30 Mar 2023 03:59:52 GMT

Hi @cernevicius.karolis ,

Did you check that the assigned parameters for these columns are the same?

Re: Same loads - different results

cernevicius.karolis — Thu, 30 Mar 2023 07:09:35 GMT

Yup. Concrete is the same, buckling length is the same, section etc...

Re: Same loads - different results

Romanich — Thu, 30 Mar 2023 07:11:27 GMT

Well, in this case, could you share the model, please?

Re: Same loads - different results

cernevicius.karolis — Thu, 30 Mar 2023 11:20:41 GMT

Sure

Re: Same loads - different results

Romanich — Thu, 30 Mar 2023 12:16:52 GMT

I have restarted the analysis and design, results now seem similar:

You have to check the warnings, some of them are critical:

Re: Same loads - different results

cernevicius.karolis — Thu, 30 Mar 2023 13:17:11 GMT

The file that I've attached is a substructure of a bigger project with results already saved within the file. I am using this substructure for reinforcing with results that were calculated in full model. Recalculating substructure does bring out errors, which don't exist in full file. Nodes which bring out the instabilities don't even exist in this substructure model.

I get same results in full model. This model has no instabilities.

Re: Same loads - different results

Stephane.kapetanovic — Wed, 17 Sep 2025 14:42:25 GMT

hi @cernevicius.karolis

I'm encountering trouble parsing your file. Panels display openings that do not concern them and others have erroneous edges. the meshing doesn't help and calculation gives instabilities.

Objects are : 207 249 280 432 701 764 770 973 1059 31295

it is not possible to go further for the moment, do you want to share us the complete model?

Best regards

report deleted