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Hello, everyone, I am using the uniaxialMaterial BoucWen to simulate the material degradation, but when I was doing the static analysis, I saw the following warning in the calculation, anyone knows how to solve it? Thanks. WARNING: BoucWenMaterial::setTrialStrain() -- did not find the root z_{i+1}, ...

HystereticMaterial is often used for steel to capture stiffness and strength degradation. There should be many examples online. Thanks a lot for your reply. HystereticMaterial is very useful to model the stiffness and strength degradation. But I don't know how the following parameters influence the...

Hello, everyone, I am looking for a stress-strain model for the steel material that can consider the stiffness degradation and strength degradation and also this material model can be used in the fiber section. Are there any recommendations for it and which one is the best option for the steel mater...

Hello, everyone, I have a question about using the following codes to do linear static analysis in OpenSees. The model is linear elastic and if static load of magnitude 5e6 is applied to the model, the output of target displacement is 300mm. For the load vector, staticload, in the following code: If...

Ashok wrote: ↑

Sat Nov 28, 2020 5:47 pm

Hi,
I am not sure about STKO, but see if this helps.
https://portwooddigital.com/2020/08/27/ ... -marplots/
This is a article written by Prof. Scott.

Thanks, it is very helpful.

I am trying to STKO's new diagram plot feature, so I just built a fixed beam to test the results. But when I fix all DOFs of node 1 and node 2, the OpenSees can not output any results. Does anyone know how to deal with it?

fix 1 1 1 1 1 1 1;
fix 2 1 1 1 1 1 1;

https://opensees.berkeley.edu/wiki/index.php/File:ElastomericBearingBoucWenFig01.png https://opensees.berkeley.edu/wiki/index.php/File:ElastomericBearingBoucWenFig01.png Hello, everyone, For the bearing element in the link, there is a relation between Fy-dy, anyone knows any references about how to...

Just tried FullGeneral, no WARNING. But it is really time-consuming.

For the output files, I designate them to different directories for each analysis.

There are some procedures shared by different analysis, which will be used by the two windows at the same time, I don't know if this will affect the results. Thanks.

dispBeamColumn needs more elements to make the results accurate enough, and FullGeneral costs more time, are there any better solutions for it? Thanks.

Hello, everyone, As described in the code below, before the transient analysis, the static analysis was carried out, the problem is when using rayleigh damping, everything goes well with the settings in the codes, but when switched to modal damping, the following WARNING will appear, WARNING - Force...

Hello, everyone, For the parametric study, I need to run two OpenSees windows to use most of the computer memory. I am wondering if it works when the two OpenSees windows are from the exact same one OpenSees.exe in the computer (say just double-click the OpenSees.exe twice and then there will be two...

selimgunay wrote: ↑

Mon Aug 24, 2020 3:36 pm

You can find a derivation and some references here:

http://citeseerx.ist.psu.edu/viewdoc/do ... 1&type=pdf

Awesome, many thanks.

Fy is the shear capacity and in a bilinear model that you use, it corresponds to the yield force. A is shear area which is equal to 5/6 of the total area for rectangular sections and 9/10 of the total area for circular sections Brilliant, for the shear area, I am trying to find some references wher...