Issues with mass and Stories

[1161314]

In Robot Structural Analysis 2022, there's an issue in dynamic analysis results if stories are created.

I've made 2 very simple models to show this.

In 1 model, i haven't created storie and get a mass of 28.297,12 kg with load to mass conversion and self weigth.

If stories are created, that value increases to 37.729,50 kg.

[Simau]

@1161314 

For calculation model, select "shell" instead of "Slab-Rigid diaphragm"

[1161314]

I've allready try that. I have the exact same model in RSA 2021 and the mass values do not change when i create stories.

[Krzysztof_Wasik]

Hi @1161314 

When generating stories in Robot 2022 open Advanced options and check off  "Create the main node forfloor diaphragmat the Gravity Center of the story projected onto the floor". Accept modifications in both dialogs. 

This new option is activated by default in Robot 2022 and results in different (simplified) stories mass distribution for structures with diaphragms.

[okapawal]

This issue has been resolved with Robot Structural Analysis Professional 2023 release.

Please find more in the Release Notes

Regards

Autodesk Robot Structural Analysis team