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Thank you very much for your reply:) 1. I did use hysteretic material instead but another error message showed at certain period (even worse). set pinchX 1.; # pinching parameter for hysteretic model set pinchY 1.; # pinching parameter for hysteretic model set damage1 0.; # damage parameter for hyst...

I am sorry that I forgot to mention Pinching materal was implemented by Dr. Altoontash (2004) for Dr. Ibarra's cyclic degradation model. In this model and Clough model, it is convenient to input My, Mp, yielding rotation, plastic rotation and cyclic degradation factor just depending on concrete sect...

Dear Silvia, Thanks a lot for your reply. I still have no idea what wrong it is even I changed mass to very low level. In addition, if I just delete the gravity load pattern and run dynamic analysis, then there were no warning messages while the period below 1.7s. I found someone has the same messag...

Dear Silvia, Thanks for your reply:) I tried to debug from the very beginning and I found the SDOF even had the same problem under gravity loading test. Below is my code and I hope you experienced experts could help me figure out what wrong it might be: # --------------------------------------------...

Hi, I am trying to build a SDOF (one bay-one story; two rigid columns+one beamwithhinges element) for spectra. I applied [uniaxialmateral:pinching for Mz and elastic section for P] to hinge parts of the beamwithhinges element. I changed mass for different period; however, when the period was larger ...

Thank you very much for your instant reply:) I tried to lower f'c but the results did not change much. The whole hysteretic loop just looked like steel one. I am wondering that since fiber section default assuming perfectly bonded so that the hysteretic loop will keep full before reaching its max st...

Dear Silvia, I am simulating the SDOF frame (two rigid coulmn and one beam with two hinges at the ends ). I applied fiber section made of concrete02 and steel02 to the hinge part. However, there is no obvious pinching observed even the cyclic drift up to 6%. Its reinf. ratio is only 1.25% and it sho...

Dear Silvia, It's one of the greatest workshop I have attended and I learned couple of good ideas about my research work with OPENSEES. I am just wondering if you could upload the slides for the 2nd day and the presenter's email address or contact information (especially Collen McQuoid's, I have tal...

Hi, I think this is a good example for a beginner of OPENSEES. I tried to keep everything the same but these three lines: uniaxialMaterial Hysteretic 2 $s1p $e1p $s2p $e2p $s3p $e3p $s1n $e1n $s2n $e2n $s3n $e3n $pinchx $pinchy $damage1 $damage2 $beta uniaxialMaterial Elastic 3 1e10 section Aggregat...