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Prevent walls to vibrate perpendicular to their own plane?

Prevent walls to vibrate perpendicular to their own plane?

Prevent walls to vibrate perpendicular to their own plane?

(OP)
I'm wondering how to prevent  shear walls to vibrate perpendicular to their own plane. I'm using the Shell Stiffness Modifiers  f11=f22= f12=0.5 (as my code guide me).  I'm not sure for m11, m22, m12. I've read topic thread802-141414: Shell Stiffness Modifiers where WillisV said that he assigned m11=m22= m12=0.01. But there will be a problem in response spectrum analysis where (in such assignments) the walls will start to vibrate perpendicular to their own plane. Even if I assign m11=m22= m12=0.5 (according to my code) walls will vibrate in undesirable modes. What is the common practice respectively how to achieve that walls will not vibrate perpendicular to their own planes?

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