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combin14 to use torsional spring

combin14 to use torsional spring

combin14 to use torsional spring

(OP)
Hi,
I have to model torsional spring in apdl. I am using combin14 element.
I need to change the stiffness to get the desired rotational frequency after modal analysis.
What I get is, this works great with 2 D shapes and donot show desired results with 3D model.
While applying the springs on 3D model, no frequency is altered based on the change in the spring stiffness. It is showing frequencies as if the model is "free-free" condition.
Please help me in identifying the error

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