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Hello,everyone! I can define the vertical mass and stiffness to get the vertical frequency,but during the timehistory analysis, horizontal and vertical mass and stiffness need to be appended at the same time to simulate the real reaction of structure, so the problem is coming, after time history ana...

The modes dictate which directions get the target damping ratios. All the other modes get whatever according to the damping spectrum. In fact,I'm not sure about it.If I define the stiffness and mass in both horizontal and vertical direction,then I use the sentences that what I have posted,I will ge...

Hello,I met a question about Rayleigh damping,I used following sentences to define the damping,but it seems like only define the horizontal damping ratio. set xDamp 0.05; set nEigenI 1; set nEigenJ 2; set lambdaN [eigen [expr $nEigenJ]]; set lambdaI [lindex $lambdaN [expr $nEigenI-1]]; set lambdaJ [...

Thanks for your reply！

Hi，everyone.I have a problem,I know that there are commands to output horizontal period/eigenvalue/frequency. Is there a way to output vertical frequency/period or vertical eigenvalue in OpenSees? set xDamp 0.05; set nEigenI 1; set nEigenJ 2; set lambdaN [eigen [expr $nEigenJ]]; set lambdaI [lindex ...