question about parameters of hysteretic material

[chris]

Hi...
I also have some question about parameters of hysteretic material.
I found another question related with this topic in this post, but i can't find answer and any other solution.
In the hysteretic model, the damage parameters related with ductility and hysteretic energy, but how can I deside the value?
In manual, there is no other guidelines. Just it is mentioned like ;
damage1 : damage due to ductility D1(mu-1)
damage2 : damage due to energy D2(Ei/Eu)

Is anyone who has some information about this?
How can I define these parameters? or is there any references?
Thanks...

[silvia]

for details, you might have to look at the code.
still, one reduces the strength on the second cycle, depending on the ductility level, the other based on the energy dissipated.
what i do is try different values until i find the one i am looking for.
this is what i use:

set damageMU 0.002; # damage due to ductility: D1(mu-1)
set damageE 0.001; # damage due to energy: D2(Eii/Eult)

[cjwxslw]

can you tell us which paper is cited when building the "HystereticMaterial", namely which paper is prototype of "HystereticMaterial" in Opensees?
I want to check the definition of HystereticMaterial parameters?
thank you!

chen