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1) In the KikuchiAikenLRB material, alpha, the apparent shear modulus of the lead plug, is used to calculate the secondary stiffness. For example, M. Ikenaga, A. Suzuki, M. Miyazaki, "Examples which applied anti-seismic devices to existing buildings and the new approval system for seismic isola...

Hi hbma,

KikuchiAikenLRB material has a strain limit of 400% shear strain, and the limit is not dependent on alpha.
If the response exceeds the limit, the material outputs the message "Response value exceeded limited strain".

Hi baikunthasilwal,
The limit for KikuchiAikenLRB material is 400% shear strain.