I am performing seismic analysis. After running modal analysis to find a how many modes to use I only get mass participation up to 55 using 60 modes.
During calculations, I receive a warning regarding eigenvalues. Is this effecting load to mass conversion?
All supports are defined as elastic.
Please help me solve this. I want mass participation over 90%.
Try to increase the number of modes. You may also try to use the pseudo modes approach.
IMHO if the warning is about missing modes then for seismic analysis then you can ignore it as your goal is mass participation rather than exact values of eigenfrequencies.
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