I modeled a RC bridge with one column bent in OpenSees. Initially, I used Concrete01 for concrete material and I used a combinatin of "uniaxialMaterial ElasticPPGap, uniaxialMaterial ElasticPP, and uniaxialMaterial Parallel" to obtain a elastic perfectly plastic model for reinforcement material for simpicity. Both static pushover analysis case and a case in which the structure was excited by a uniform earthquake ground motion finished well.
However, if I change Concrete01 to Concrete02 for concrete or if I use ReinforcingSteel to model reinforcement materials, I get converge problems in the static pushover analysis and the earthquake case as well. Especially, when I used ReinforcingSteel, the information I got is, "Set Trail <> - material failed in Set TialStrain<>; Large trial Compressive Strain".
I tried use more advanced and accurate material models for my study, but I failed. Could you help me solve these problems?
Thank you in advance.
one question about using "uniaxialMaterial ReinforcingS
Moderators: silvia, selimgunay, Moderators
try changing materials one at a time to see which one is causing problems.
The messages i see in your message i have seen with reinforcing steel. That's a contributed material and you'd have to contact the authors directly.
Have you considered hysteretic material for the steel? i love it!!!
The messages i see in your message i have seen with reinforcing steel. That's a contributed material and you'd have to contact the authors directly.
Have you considered hysteretic material for the steel? i love it!!!
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
I did change the material one at a time.
1. If I only change concrete01 to concrete02, my static pushover case is not converge and also the earthquake case failed after just several seconds.
2. If I remain concrete01 for concrete material and use reinforcingsteel for rebars, for both pushover and earthquake case I got "Set Trail <> - material failed in Set TialStrain<>; Large trial Compressive Strain" information.
I will try to contact the auther for problem 2. But do you know what happened to problem 1? I think Concrete02 is widely used by many people.
Thank you very much!
1. If I only change concrete01 to concrete02, my static pushover case is not converge and also the earthquake case failed after just several seconds.
2. If I remain concrete01 for concrete material and use reinforcingsteel for rebars, for both pushover and earthquake case I got "Set Trail <> - material failed in Set TialStrain<>; Large trial Compressive Strain" information.
I will try to contact the auther for problem 2. But do you know what happened to problem 1? I think Concrete02 is widely used by many people.
Thank you very much!
I think you have subjected the concrete to really high tensile strains, and it is giving you problems -- but your demands are unreasonable/unrealistic.
-- likely, of course.
try tracking it down to where this is happening and plot the moment/curvature and then stress/strain of where this is happening.
good luck with problem 2. again, i recommend you use the hysteretic material.
-- likely, of course.
try tracking it down to where this is happening and plot the moment/curvature and then stress/strain of where this is happening.
good luck with problem 2. again, i recommend you use the hysteretic material.
Silvia Mazzoni, PhD
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
Structural Consultant
Degenkolb Engineers
235 Montgomery Street, Suite 500
San Francisco, CA. 94104
hi, Silva,
Thank you so much for the reply. I did contact the author about using Reinforcingsteel problem. He said this may due to converge problem in OpenSees or the strain is too large. So I try to track which reason causes my problem. Now here is my situation:
I modeled the column using nonlinearBeamColumn elements. I have 60 one-column bent bridges with different column cross section various in material properties and geometry. When doing 60 Pushover Analysis with Concrete01 and a elastic perfectly plastic model for the materials, most of pushover analysis can be done without any problem. However, almost 20 bridges gave me warning such as this:
WARNING ForceBeamColumn3d: update-failed to get compatibale element forces & deformations for element:2001 <dw:<<0.0242305, dw0: 7.29889+0.26>.
Although, eventually those pushover analysis with above warnings can still run through but some of them failed before they reach the displacement I defined. I am wondering how to solve this problem so that the Pushover Analysis can run through without giving such warnings. (BTW, I used the pushover analysis procedure developed by Silvia Mazzoni & Frank McKenna, 2006).
Another thing is, I found that for the case whose pushover analysis has warnings, if I change the steel material to ReinforcingSteel, it will gave me "Set Trail <> - material failed in Set TialStrain<>; Large trial Compressive Strain" information. So I think the converge problem causes the problem for using ReinforcingSeel. Can you please help me with the converge problem in Pushover analysis?
Thank you so much!!
Thank you so much for the reply. I did contact the author about using Reinforcingsteel problem. He said this may due to converge problem in OpenSees or the strain is too large. So I try to track which reason causes my problem. Now here is my situation:
I modeled the column using nonlinearBeamColumn elements. I have 60 one-column bent bridges with different column cross section various in material properties and geometry. When doing 60 Pushover Analysis with Concrete01 and a elastic perfectly plastic model for the materials, most of pushover analysis can be done without any problem. However, almost 20 bridges gave me warning such as this:
WARNING ForceBeamColumn3d: update-failed to get compatibale element forces & deformations for element:2001 <dw:<<0.0242305, dw0: 7.29889+0.26>.
Although, eventually those pushover analysis with above warnings can still run through but some of them failed before they reach the displacement I defined. I am wondering how to solve this problem so that the Pushover Analysis can run through without giving such warnings. (BTW, I used the pushover analysis procedure developed by Silvia Mazzoni & Frank McKenna, 2006).
Another thing is, I found that for the case whose pushover analysis has warnings, if I change the steel material to ReinforcingSteel, it will gave me "Set Trail <> - material failed in Set TialStrain<>; Large trial Compressive Strain" information. So I think the converge problem causes the problem for using ReinforcingSeel. Can you please help me with the converge problem in Pushover analysis?
Thank you so much!!
I did not use ReinforcingSteel material now. I am sorry that I did not say it very clearly.
However, I am not sure how to solve the problem when I do the pushover analysis with Concrete01 material and a elastic perfectly plastic model (not ReinforcingSteel), it gives me the warning like following:
WARNING ForceBeamColumn3d: update-failed to get compatibale element forces & deformations for element:2001 <dw:<<0.0242305, dw0: 7.29889+0.26>.
Could you help me with this? Thank you so much!
However, I am not sure how to solve the problem when I do the pushover analysis with Concrete01 material and a elastic perfectly plastic model (not ReinforcingSteel), it gives me the warning like following:
WARNING ForceBeamColumn3d: update-failed to get compatibale element forces & deformations for element:2001 <dw:<<0.0242305, dw0: 7.29889+0.26>.
Could you help me with this? Thank you so much!