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Probably an error with the inputs. You'll have to show us the input command you used. Dear Prof. Michael H. Scott, thank you very much for the response.The input command related to Bilin02 that has been used for the model is as follows: uniaxialMaterial Bilin02 3 $Kspr $strhard $strhard [expr 1.0*$...

Hi everyone, when I run a steel frame model, in which the uniaxialmaterial Bilin02 has been used, I faced the following problem, please guide me to solve the problem, thank you in advance.

warning could not create uniaxialmaterial Bilin02

Hi everyone

I modeled a frame with viscous damper using the viscousDamper material, but when I run the model, the following message appeares:

Warning: could not create uniaxialmaterial ViscousDamper

I would be grateful if everyone could help me to solve this problem.

Dear anahitaah

Please follow these links:

http://opensees.berkeley.edu/workshop/O ... -Final.pdf

http://www-2.unipv.it/compmech/publications/2007_6.pdf

Hi everyone I have a question about the Hysteretic Material. In this material model, is the third point, i.e. (e3p S3p) defined only to determine the slope of the third line? or, Is it important the distance between the e3P and e2P points (X coordinates)? I tested different distances between the e3P...

Thanks so much Dr. Selimgunay

About first way that you mentioned in previous post, how can change the Hysteretic material to the EPP material?

Is there anyone who can help me?

"Could you check how the force displacement looks like with the hysteretic material with adjusted cyclic parameters" I performed two analyses (SDOF system), once using EPP and again using hysteretic material with adjusted cyclic parameters, as Dr. fmk mentioned in previous post, but when I compared ...

"Do you mean test data as reference?" When a SDOF system is modeled using EPP material, I check dynamic analysis results with the book by Chopra - Dynamics of structures, but when a SDOF system is modeled with Hysteretic material, is there any reference to check dynamic analysis results? How should ...

Hi everyone

I have modeled SDOF systems using "Hysteretic material" model in the OpenSees software. In this regard, is there any reference to verify response of dynamic analysis of a SDOF system modeled by "Hysteretic material"? I would be grateful if anybody could guide me.

Dear Dr. fmk Thank you very much. I did it but the results of analysis using Hysteretic and EPP materials are not identical. I changed Hysteretic material parameters as you mentioned, as follows: uniaxialMaterial Hysteretic 1 [expr $k1*$dy1] $dy1 [expr $k1*$dy1] [expr 1000000000.0*$dy1] [expr -1*$k1...

Hi everyone Is it possible to convert Hysteretic material model to EPP (Elastic-Perfectly Plastic) material model, such that once a analysis is performed with EPP model, then the analysis is performed with the changed Hysteretic material, and both results of two analyses become identical? Best Regards

Hi everyone I have a two degree of freedom system with nonzero initial displacements and velocities different at the two degrees of freedom. How I can analyze the free vibration of the system using time history analysis by defining Precisely initial conditions in OpenSees? Many thanks for your kind ...

Hi everybody
I have a two degree of freedom system with nonzero initial displacements and velocities different at the two degrees of freedom. How I can analyze the free vibration of the system by OpenSees? Many thanks for your kind attention.
Best Wishes,

Thank you very much dear Jhno. I appreciate your kind attention and guidance. However, my question is conceptually slightly different, that I am now adding it as a new post entitled "Precisely defined nonzero initial conditions for time integration".