Mike Pettit
Ansys Employee

Hello Greg,

I've just double-checked on my side and I can confirm that the Connection Stiffness matrix is certainly included in the stability analysis Natural Modes result when the 'Include Linear Connection Stiffness Matrices' option is set to 'Yes'. Maybe the stiffnesses that you have defined are just not large enough to affect the solution much (i.e. small compared to hydrostatic stiffness)?

Cheers, Mike