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Hyesteresis loop envelope

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Hello !!!

Has anyone used uniaxialMaterial Pinching4 command in
OpenSees platform ?  

I shall be glad if anyone can help me to determine the
Stress-Strain envelope points p1, p2, p3 ... etc.  

I searched through the OpenSees Manual but no specific
formulae or any sample calculations have been
presented for determination of these points.

Thank you,

With regards,


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