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HI Yu Wei, here is the Python code that you can use to compute the stress ratio. It will produce a stress tensor whose components are the ratio of the current_component-initial_component/initial_component Then in post-processing, you can just visualize the second (S22) component. from PyMpc import *...

Thanks for finding this issue. There was a bug. It will be fixed in the next release (2.0.5) In the meantime here's the fixed python file: ElasticBilin.zip Unzip it and copy its content (ElasticBilin.py) in C:\Program Files\STKO\external_solvers\opensees\physical_properties\materials\uniaxial , over...

This new element has been added recently to the official OpenSees repository, but the official OpenSees executable has not been recompiled yet. However, this element is already available in the OpenSees Solvers available from prof. Tarque's webpage. Download the latest version and this error should ...

Let's say that achieving that in OpenSees is not super easy now. 1) You need a contact detection algorithm, because the tyre travels in time, and the contact element should be updated at every step. OpenSees does not have such a tool now. We are working on it, but I cannot tell you when it will be r...

Dear Yu-Wei, In the current version of STKO (2.0.4), you can create a virtual result from operations involving similar results: nodal results with nodal results elemental results with elemental results. Unfortunately, water pore pressure is a nodal result, while the S22 is a component of the stress ...

Hi YuWei,

So what you want to calculate is PWP/Sigma_22 ?

Could you give me the exact equation you want to implement so that I can give you an example?
Also, do you want to visualize this result in a STKO Plot, or do you just want to extract data at nodes programmatically in python?

Yes it happens because we did that model with an old version of STKO. In the old version, we did not have the wipeAnalysis command automatically set to True at the end of the Analysis command. Also, we did not have the concept of Fixed time-step and Adaptive time-step built-in into the Analysis comm...

You just need to discretize your beam along its axial direction

To account for small-delta effects you just need to discretize your member, so that P-LargeDelta in every mesh become a P-smallDelta for the entire member.

the RCBeamColumnProperty is just a way to automate the creation of beam-column elements, but it still under development.

However, what was described in that paper can be done with the Section Aggregator and a pinching4 or ModIK material for shear