Autodesk Robot Structural Analysis

[#1]

Here it is

[#2]

Tony,

Am I right saying that you have only claddings (no materials properties assigned) in your model? I think that you should replace them with curtain walls that have their self-weight included in the modal analysis.

[#3]

NO, I was running the model with claddings but also with user defined calculation options for mesh (check the "BONDEK" definition.  

I changed BONDEK to "Deck Slab" and it works OK.  

[#4]

Tony,

Please look at post 5 and the pictures attached there. I'm very sorry if I'm wrong but it seems that you missed the fact that to include self-weight of claddings you have to use load to mass conversion (and switch off use of self-weight in the modal analysis parameters). I made a quick test with the 'right' settings and Bondek panel calculation model assigned to panels 83 and 1931 obtaining similar results for introduced self-weight case case and modal analysis total mass.

[#5]

Yes thats what I was missing.  Thanks!

Tony