search

amaelkady / Updated-IMK-Models-for-OpenSEES

Documentation for the updated modified Ibarra-Medina-Krawinkler deterioration models (Bilinear, Peak-Oriented, Pinching). These models supersede those in OpenSEES where convergence problems are fixed.
GNU General Public License v3.0
4 stars 4 forks source link

IMK Pinching Issue #2

Open jwberman opened 2 years ago

jwberman commented 2 years ago

Hi Ahmed,

Thanks again for all your help getting the new IMK models running. I have a new problem with the IMK pinching model in the opensees you compiled for me a while back. (It is version 3.2.1 with a note that IMK is written by you, see screenshot below). The model parameters are listed below as well. Is this a known problem with IMKpinching?

IMKPinchProblem

opensees version

Parameters:

uniaxialMaterial IMKPinching 108 142.20000000 44.70000000 36.10000000 150.00000000 831.80000000 1.10000000 0.05000000 44.70000000 36.10000000 100.00000000 831.80000000 1.10000000 0.05000000 1000.00000000 1000.00000000 1000.00000000 1000.00000000 1.00000000 1.00000000 1.00000000 1.00000000 1.00000000 1.00000000 1.00000000 1.00000000;

Ke=142.2; Up_pos=44.7; Upc_pos=36.1; Uu_pos=150; Fy_pos=831.8; FmaxFy_pos=1.10; FresFy_pos=0.05; Up_neg=44.7; Upc_neg=36.1; Uu_neg=100; Fy_neg=831.8; FmaxFy_neg=1.10; FresFy_neg=0.05; Lamda_S=1000; Lamda_C=1000; Lamda_A=1000; Lamda_K=1000; c_S=1.0; c_C=1.0; c_A=1.0; c_K=1.0; D_pos=1; D_neg=1; kappa_F=1; kappa_D=1;

amaelkady commented 2 years ago

thank you for raising the issue. Are you using the opensees executable provided in this repo?

jwberman commented 2 years ago

yep

jwberman commented 2 years ago

https://github.com/amaelkady/Updated-IMK-Models-for-OpenSEES/blob/master/OpenSees.exe

jwberman commented 2 years ago

This is Jeff Berman, we corresponded about 9 months ago and you put this version together for me, which is greatly appreciated!

amaelkady commented 2 years ago

ok; hi Jeff. can you send me the deformation history from the figure above and I will check the model.

jwberman commented 2 years ago 
   disp = [5 10 15 20 30 40 50 60 70 80 95 100 110 120 130]; % input displacements for cyclic cycles
    Ncycles = [2 2 2 2 2 2 2 2 2 2 2 2 2 2 2]; % number of cycles per input displacement
amaelkady commented 2 years ago

Thanks but i need the exact deformation data points as extratced from opensees (the ones used in the plot)

jwberman commented 2 years ago

Oh, right. Sorry. 4th column in the attached. node_disp.txt

amaelkady commented 2 years ago

thanks jeff. I will check it and let you know

amaelkady commented 2 years ago

Is there a reason why you are using the pinching model with kappa=1 instead of the peak-oriented model?

jwberman commented 2 years ago

You're right, i could use the peak oriented. We are using this because it is a base case where will be adding pinching. I could switch to peak oriented for kappa eqaul one if that is a problem then swith to pinching for othe values. Wanted to try to stay consistent.

On Sun, Jun 19, 2022, 12:23 PM Ahmed Elkady @.***> wrote:

Is there a reason why you are using the pinching model with kappa=1 instead of the peak-oriented model?

— Reply to this email directly, view it on GitHub https://github.com/amaelkady/Updated-IMK-Models-for-OpenSEES/issues/2#issuecomment-1159796383, or unsubscribe https://github.com/notifications/unsubscribe-auth/AWFWOERAQGUD5TLJYJJ2ZRDVP5XS3ANCNFSM5ZDB4OLQ . You are receiving this because you authored the thread.Message ID: @.***>

amaelkady commented 2 years ago

hi Jay, an updated opensees exe is uploaded now. check it and let me know if this issue is resolved.