The OpenSees Community

Hi everyone
I am modeling a 5 story X-brace system but its pushover analysis doesn't converge.
Can someone give me the required code?
I have attached the model here:
https://ufile.io/xegch
Thanks

Hi everyone

I am trying to model a one-story steel frame with diagonal CBF bracing. I want to simulate a hinge located in the middle of the brace, according to the multi-linear backbone curve introduced in the ASCE 41-13 with corresponding parameters stated in Table 9-7.

How can I model this behavior in OpenSees?

Thanks

Hi
I want to model an equivalent SDOF with Bilin material. My original structure is steel frame.
I want to consider the cyclic deterioration parameter (Lamda) for the SDOF model.
Is there any relation or approximate value for this aim?
For equivalent SDOF of concrete frames, Dolsek presented a approximat value, but I can't find any similar value for steel frames.

I want to model an Ibarra-Krawinkler hysteretic material for an infill compressive strut with these parameters:
Fy_strut , delta_y_strut
Fc_strut , delta_c_strut
Fr_strut , delta_r_strut
k_f_strut , k_d_strut (Pinching parameters corresponding to stress and strain)
According to this picture: http://uupload.ir/files/jqr8_strut_matrial.jpg

When I used "Hysteretic" material, it didn't converge and the results of pushover analysis would be clearly wrong.

Now, what is the solution? Which material is suitable for this aim?

ashf wrote:
> I've gotten this error already,because the value of second strain should be
> bigger than first strain,third strain should be bigger than second strain.

Thank you for the solution . The problem was solved

According to bellow picture, I want to model an Ibarra-Krawinkler hysteretic material for an infill compressive strut:

http://uupload.ir/files/jqr8_strut_matrial.jpg

When I used "uniaxialMaterial Hysteretic" material, this error apeared:
"HystereticMaterial::HystereticMaterial -- input backbone is not unique (one-to-one)"

On the other hand, "uniaxialMaterial ModIMKPinching" doesn't consider the pinching factor for strain (kd) and "uniaxialMaterial Pinching4" material is very complicated.

Now, what is the solution?
How can model an asymmetric hysteresis material with pinching parameters (kd and kf) in Opensees?