Hi All,
I think there is problem with seismic equivalent lateral force method which is related to mass source
Robot only consider the self weight of the structure when it calculates this force .
There is no option to include other loads to seismic mass .
@mustafahesenow Artur Kosakowski edited the topic for better findability
Hi@ mustafahesenow
There is no option to include other loads to seismic mass.
You may use Load to mass conversion option to add any loads to seismic mass.
Refaat
Mind that for this type of analysis self weight is ALWAYS automatically included so you should't convert it (again).
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.
What if I have 2 seismic cases one dynamic and one static or even both of them static with different load to mass conversion
Do you think this is doable in one model ?
Hi Mustafa,
Tricky but doable 
As you know you can assign different load to mass conversions to the modal and the following response spectra analyses but for the static seismic it is done by the global (to all) flag. If so the required steps would be:
1. Use the global load to mass conversion for the cases you want to convert for static seismic
2. Add conversion of 'missing' cases and convert additionally created dummy -1*load cases you want to exclude from the global conversion for the modal case followed by response spectra ones
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.
But by this case both of the 2 static seismic cases have the same loads (means they are same exactly in load conversion )
My thinking that we cant make 2 seismic static cases with different mass conversion in one model one time
As example :
Static seismic case 1 with mass conversion all dead load
Static seismic case 2 with mass conversion all dead load + 0.25 Live load
Robot will proceed for both of the 2 seismic load cases with mass conversion Dl +0.25 LL
That why I wrote this topic to draw your attention That for seismic static load it should be add it in mass conversion similar to modal case
So it can easily specify for each load case its mass.
My reply was for one dynamic and one static case:
What if I have 2 seismic cases one dynamic and one static
For two static this cannot be done as it is not possible to assign the conversion to the selected static seismic case 
I have created the corresponding development request on your behalf.
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.
Noted many thanks.
