Have you tried gap elements?
GSA already gives an option to get the SRSS combination of response spectrum results in different directions. This is part of the Response Spectrum Analysis option.
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CSA A23.3 added to AdSec
This is in AdSec 8.4, but not yet in ADC 8.4.
The current version of AdSec only allows for a single 'analysis task'. This is a restriction that we would like to remove in a future version, and this would make options like this possible.
While 1D element properties sounds attractive for sections, it would then be unclear where spring, cable and link properties would go.
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A laminated shell sounds like a useful feature, but would is be used much? I think is would be best implemented as new 2D property type "laminated shell" (distinct from a "shell"). The user would need to define layers and associate a material with each layer.
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How does this differ from a combination case?
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Generating the whole onion should be significantly faster than generating an N/M chart as we can create and integrate a series of strain planes to produce points on the onion.
This work is in hand.
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This is worth investigating to see if there are inefficiencies in the solution that can be eliminated.
Parallelisation is something that is being considered across the engineering programs.
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Sub-structuring is a way of breaking the structure into smaller parts. The solution then assembles the stiffness of each of these sub-structures and reduces this to the stiffness at the connection nodes. It then assembles the stiffness of the structure as a whole and solves. From the displacements of connection nodes the displacements in the substructures can be calculated.
The main advantage of this technique is that it gives a clear route to parallelising the solution.