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Many thanks for your reply

Dear users I'm trying to use modalDamping command recommended by prof. Chopra but apparently the command does not work with some of the integrators provided in OpenSees I've used modalDamping command with central difference, generalized-alpha and KRAlphaExplicit integrators and the following error a...

fmckenna wrote: > betaKcomm will use the stiffness matrix at the last time step .. as for > modal > > It should be in the version available for download. Not all solvers have > been modified to work with it, all but the sparse should work, and it does > not work yet in parallel. > > there are 2 comm...