Hi Javier,
If you are using Release 2022 R1, you can turn off NASF by turning on Beta Options (from the Project Schematic, open Tools > Options, then under Appearance you should find the Beta Options checkbox - you will need to restart the Aqwa Workbench editor for this to take effect). Then there is an option 'Include Linear Connection Stiffness Matrices' in the Hydrodynamic Response Analysis Settings - setting this to Yes will turn off NASF.
I hope this helps.
Mike
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