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Also, I can't find any information on the frequency shift, cutoff frequency and convergence tolerance - maybe they can help me get rid of the modes that do not contribute?

Hi, I am performing a model analysis using eigenvectors. I have a 3D structure that has all translational and rotational dof's active which requires over 90 modes to obtain a mass participation ratio of 90% in all translational directions. The structure is inclined, which means that...

Actually, I don't experience the problem any longer. Don't know what I was doing wrong earlier. Anyway, thanks for the reply, I appreciate it :)

Ok, thanks :)

Hi Guys I have a problem with constant modal damping in SAP2000. It doesn't seem to have an effect on the response when I change the damping, even if I set it to 0,99.. Has anyone encountered this problem? I cannot figure out what is wrong.. Thanks, ea¨

Hi Guys I have a question about linear modal time history in SAP2000.. Is it necessary to define acceleration loads as shown in the attatched picture? I assume that the software solves the equation of motion mu''+cu'+ku=F(t) and so far I thought that I only needed to define external forces...

Is it not possible to use partial fixities when performing a linear modal or time-history analysis?

Hi guys Is it possible to change the phase angle of a load that is defined as a time history sine function. I can't find it anywhere, the "angle" in "load case data - linear modal history" doesn't quite do the trick. I want to use the time history function for multiple loads and it would help...

Sure,Link

Hi guys I have a problem with the partial fixity properties of frame elements when performing a modal analysis. There is no problem if working with 2D frame systems. However, when the system is three-dimensional, I am not able to define partial fixity for moment 22 while moment 33 is fully...