asdeasoft.net

Dear STKOteam,

I have some questions regarding the PDMY material constitutive model and would appreciate your assistance:

1. Differences in Shear Contraction, Dilation, and Liquefaction Parameters
The parameters listed on your website differ from those in the main references, particularly for ...

Thanks for your explanation!
I will make a comparison with the effect of whether there is initial displacement.

During the tunnel construction process, the excavation area is initially larger than the tunnel itself. Before formal construction, this excavation area undergoes continuous deformation. To accommodate this, the gap between the constructed tunnel and the deformed excavation face is filled by ...

Hi everyone,

I'm trying to use the MultiaxialCyclicPlasticity constitutive model for an initial analysis, but it’s not included in the OpenSees documentation for constitutive models. I found the source code for this model on GitHub. By default, the material stage is set to 2 (plastic stage), but I ...

I think I understand your point.
However, if the soil in the second stage is replaced by a shield tunnel, can this approach achieve the same results as the initial analysis? Since the tunnel and the soil share a common boundary, it's important to consider that after the first stage of analysis, the ...

STKO Team wrote: ↑

Fri Oct 25, 2024 8:18 am

The initialStateAnalsysis is only useful when you are doing stage analysis and you want to reset the initial displacement to zero while keeping the initial stress.

Actually, this is exactly the functionality I need. Is there any way to accomplish this?

STKO Team wrote: ↑

Thu Oct 24, 2024 10:23 am

The InitialStateAnalysisWrapper does not support the "materialState" keyword for parameters!

The BoundingCamCly material needs "materialState" to enter the plastic stage.
Is there another method to conduct the initial analysis with BoundingCamCly material?

Yes, it works for a simple model.
However, for a relatively complex model, the BCC's convergence ability seems poor.
I've tried to change the test tolerance, gird size, and steps with the most robust Newton algorithm, even for the first elastic stage.

Dear STKOteam,
It's so weird!
I made a reloading cell test with a 1m×1m size， it worked well.
However, when I changed its' size to 200m×100m, it couldn't converge.
The two models have no difference except for the model size.
Could you help find out where the problem is?

Looking forward to your reply!

Thanks, this gives me a deeper understanding of the use of this constitutive model.
Best wishes!