I have a concrete sluice with a steel bridge on top, all in the same model.
I’m now checking that the eigenfrequencies of the bridge are within allowable limits.
When running an eigenvalue analysis in ase:
+prog Ase $ Eigenvalues
head
MASS lc 2 prz 100
EIGE neig 20 lc 501
END
This is all well and good, but as I’m only interested in the activated mass of the bridge and it’s a lot lighter than the concrete structure, it’s mass is lost in this table.
As such, is it possible to get the activated mass for individual groups?
If I understood correctly, you want to take into account only the weight of the bridge. In that case, you can deactivate the mass of the sluice using the command GRP xxxx FACM 0.00.
Another option would be to assign a zero-weight concrete to the sluice structure, so only its stiffness is considered.
Otherwise, the simplest solution is to model the bridge structure separately in an individual model, which you can then easily extract and integrate into your global model. You can find specific commands for this in SOFIMSHC/SOFIMSHA.
Where would you deactivate the sluice mass, GRP in ASE has no FACM? It does have a FACD entry, but this doesnt’ actually change anything in the output.
I’m also not sure this is a solution as the output is in percentages.
What I’m looking for is a way to filter the output so I only see the mass from the steel bridge.
I agree that creating it in two separate models is a solution, I’d just rather maintain it in a single model for simplicity.
