There is no Takeda hysteresis rule in the original OpenSees...! However, it can be roughly resembled through "Hysteretic" or "Pinching4" materials. All of these models are rectilinear (polygonal) and have lots in common. You can simulate Takeda, for example with "Hysteretic" material as follows,
There is no pinching in Takeda, so use
pinchX=pinhy=1
There is also no strength degradation in Takeda, so use
damage1=damage2=0
(defined envelop can have negative stiffness to resemble strength deterioration)
Takeda's stiffness is degraded, so use
beta=0.7 or 0.8 or .... (depending on the required stiffness degradation)
There is no Takeda hysteresis rule in the original OpenSees...! However, it can be roughly resembled through "Hysteretic" or "Pinching4" materials. All of these models are rectilinear (polygonal) and have lots in common. You can simulate Takeda, for example with "Hysteretic" material as follows,
There is no pinching in Takeda, so use
pinchX=pinhy=1
There is also no strength degradation in Takeda, so use
damage1=damage2=0
(defined envelop can have negative stiffness to resemble strength deterioration)
Takeda's stiffness is degraded, so use
beta=0.7 or 0.8 or .... (depending on the required stiffness degradation)
Hello Reza, I have done quite a bit of work in modeling hysteresis behavior especially including pinching. I will be happy to help if you can send me a direct email and let me know what is the goal of your research. You can contact me at: [email protected]
All the best.
kindly provide a paper or source for the Takeda hysteresis model??
Thank you very much for the help, I am modelling unreinforced masonry in opensees and I need a constitutive law for the shear, based on Takeda model; the answer helps me so much.
Regards,
Wilson
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