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Dear STKO,
I have a question regarding the implementation of Rayleigh damping in OpenSees/STKO for seismic analysis of semi-infinite soil domains.

In conventional Rayleigh damping, the mass- and stiffness-proportional coefficients are usually determined from the first and second natural frequencies ...

Thank you for your response. I will do this task and, if you’d like, I can share the result in the forum.

Dear STKO Team,
I hope this message finds you well.
I am currently working on a geotechnical simulation in which I need to model the nonlinear elastic behaviour of bedrock. My goal is to represent a material that:
• Exhibits a nonlinear stress-strain relationship
• Remains fully elastic and ...

Thanks.

Thanks.

Dear STKO

I have a question regarding symmetry in 2D and 3D soil models. When I want to analyze only half or a quarter of the model, how should I apply the boundary conditions?

Thank you.

Dear STKO
Is the use of constitutive models such as PDMY or Manzari-Dafalias appropriate for modeling soil behavior under bi or tri-directional earthquake loading?
Can these models accurately predict the response of sand to vertical (Z-direction) ground motions?
Thanks

Thanks.

Thanks.

Can I use the yield stress formula in both three-dimensional space and plane strain two-dimensional space?

Thank you for your response. I am familiar with the existing constitutive models in the software, such as PDMY, etc., but since they require a lot of input parameters and I believe calibrating each model to match the soil layers at the study site would be time-consuming, I decided to use a simpler ...