Hi
I have a question on procedure of creating and using superelements:
For example: I created an integrated jacket and topside model. The common support joints being 401, 402, 403 & 404. I applied 2 gravity load cases DL & LL while applied a horizontal UDL to jacket legs in x direction. Jacket legs have fixity as 'fixed'.
step 1: In order to create superelement I went to 'options' within precede and selected 'create superelement'. Then went to analyses structure by inputting joint fixity to 401, 402, 403 & 404 as 222222. I analysed the structure using Static analysis and sub-option as Basic static analysis.
step 2: I deleted the deck and changed the fixity of joints 401, 402, 403 & 404 to 000000. My load conditions remained the same, obviously, DL and LL loadcase exist but no loading available to them (as deck has been deleted). I selected 'input- superelement' and when went to analyse the 'jacket only' using Static (Basic Static Analysis) it asks for superelement file but it doesn't exist!!
Please suggest the right procedure.
Thanks.
Instead of running a Static Analysis - Basic Static Analysis in step 1, you need to run a Utilities - Create Superelement Analysis in order to generate the superelement (subsef) file.
You may refer to Sample13 included in the installation directory of SACS for a working example of this workflow.
Regards,
Geoff
When you run the Utilities - Create Super Element Analysis, the loading specified in the Model File (sacinp) or Seastate Input File (seainp) are saved to the Superelement File (subsef). You can then reference those loads in any subsequent analysis when the superelement file is referenced.
Sample13 is doing the exact thing you describe; the deck loading is saved to the superelement file and then referenced by the seastate input file used in the subsequent static analysis of the jacket. I would recommend reviewing the sample model when putting together your analysis.
You can specify a superelement file by entering "I" on column 9 on the OPTIONS line in you SACS input file (See Below). When you create your analysis run file a location to enter the superelement input file should appear.
Alternatively, you can specify a superelement input file without modifying your SACS model file by selecting "Edit Solve Options" in the Analysis Generator and then selecting "Yes" in the Include Superelement File option.