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Thanks for your advice Professor, in the past simpler models don't show the same blow up response using similar damping parameters. Fortunately, the rest of the results in the complex model make sense, at the element and at the system level, displacements, forces, strains, stresses. I will continue ...

I have been applying rayleigh damping through the command: rayleigh $alphaM $betaKcurr $betaKinit $betaKcomm Using the value betaKcurr and betaKcomm as 0, thus just considering beta for the initial stiffness. I'm inputting the command before defining the UniformaExcitation. I'm hesitant to increase ...

Hello all, I'm working with a fairly complex model in OpenSees with thousands of degrees of freedom (not reproducible through text here) and I'm running a nonlinear time history analysis through the Uniform Excitation command, a Newmark integration scheme with parameters gamma=0.5 and beta=0.25 is u...

I'm assuming you want to do a response spectrum analysis? There is a responseSpectrum command if that's what you're looking for, I've never used it but you can look into the documentation if that's what you're looking for: https://opensees.github.io/OpenSeesDocumentation/user/manual/analysis/respons...

Thank you very much!

I'm working on a nonlinear model and looking to investigate the effect of applied rotational accelerations at the base. My idea in to how to input the rotations is to generate a master node at the base, fix it, and generate a rigidDiaphragm constraining all of the nodes at the base level. I'd like t...