2 levels of super-element in SACS

Dear Geoff and other,

I have question about superelement.

Is it possible for create 2 levels of superelement in SACS?

Fex,

We import super-element from party 'A' to apply at joint #1.

In our analysis, we also need to create super-element at joint #2 for party 'B' to do their own analysis.

Thank in advance for your advice.

Regards,

Kasiphon

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  • Kasiphon,

    You can do it, but it takes some manual editing of the Utilities > Create Superelement runfile. You need to specify the SUBIN variable before your run SACWPRE (Preprocessor which uses the superelement input file to build the stiffness matrix):

    SET SUBIN=subsef.deck.sample13
    
    SACTIM SACWPRE STARTED AT
    
    IF NOT AVAR 1001 GOTO PREINPUTLOAD
    	run ~sacsprog~SACWPRE < seaoci.test >> sublst.test
    :PREINPUTLOAD

    You also need to specify that 1 superelement file is input and 1 superelement file is output. These options are located on the OPTIONS line:

    You should get a superelement output file which includes the stiffness of the first superelement. I've attached a model which illustrates the difference for a jacket model with the deck superelement and without. The only two input changes are to the runfile and the SACS Option line.

    SUB Input + Output.zip

    If you need to use multiple superelements as input, you need to merge the superelements using the Utilities > Merge Superelement analysis type. Note that both superelements need to be connected to the 3 structure if you use this method (IE interface joints are connected to structure 3).

    I will talk with the developers and see if we can add this to the Utilities > Create Superelement runfile to make this process easier.

    Regards,

    Geoff

Reply
  • Kasiphon,

    You can do it, but it takes some manual editing of the Utilities > Create Superelement runfile. You need to specify the SUBIN variable before your run SACWPRE (Preprocessor which uses the superelement input file to build the stiffness matrix):

    SET SUBIN=subsef.deck.sample13
    
    SACTIM SACWPRE STARTED AT
    
    IF NOT AVAR 1001 GOTO PREINPUTLOAD
    	run ~sacsprog~SACWPRE < seaoci.test >> sublst.test
    :PREINPUTLOAD

    You also need to specify that 1 superelement file is input and 1 superelement file is output. These options are located on the OPTIONS line:

    You should get a superelement output file which includes the stiffness of the first superelement. I've attached a model which illustrates the difference for a jacket model with the deck superelement and without. The only two input changes are to the runfile and the SACS Option line.

    SUB Input + Output.zip

    If you need to use multiple superelements as input, you need to merge the superelements using the Utilities > Merge Superelement analysis type. Note that both superelements need to be connected to the 3 structure if you use this method (IE interface joints are connected to structure 3).

    I will talk with the developers and see if we can add this to the Utilities > Create Superelement runfile to make this process easier.

    Regards,

    Geoff

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