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What is the definition of $mu (ductility factor of the hoop steel) for ConfinedConcrete01 Material ? Is it the ratio of ultimate strain to yield strain of the hoop steel ?
Thanks!

I used Elastic PP material because of initial strain and struss elements to simulate the cables of cable-stayed bridges, but failed. How to simulate the cables of cable-stayed bridges?

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Today, I found two reference files about damage model and damage recorder which I never saw them in the lastest OpenSEEs command language manuals. I very need these two commands in my codes, but error messages such as "WARNING recorder ElementDamage: section keyword not specified." or &quo...

The numerical instability can be attributed to the non-convergence at a high level of nonlinearity. In general, we refer to this numerical instability as “collapse” of the structure. The drifts at collapse can be considered to be infinite. However, the calculation is always convergent until the max ...

If my codes are verified, I'm willing to share them with everybody！

Thanks for your reply！I have already written some codes to calculate modal participating mass ratios and modal participation factors.

Hello everybody:
How to get modal participating mass ratios or modal participation factors in opensees directly?

Thanks for your attention!

If you have the model of nonlinear beam-column elements using the Pinching4 material, can you give several examples to me?
Thank you very much!

I have already defined the Pinching4 material using force-deformation relation to exhibit the cyclic degradation of strength and stiffness. However, can I make use of the Pinching4 material to define a section which can be used in Nonlinear beam-column elements? Can I define a fiber section using th...