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modal Mass participation ratio vs modal load participation ratio difference

modal Mass participation ratio vs modal load participation ratio difference

modal Mass participation ratio vs modal load participation ratio difference

(OP)
Hello all,


Ia m conducting dynamic analysis .

I am trying to get 90 % modal mass participation ratio, however a friend of mine told me to check modal load participation ratio instead.

Actually ,I am not convinced, although the modal load reach 99% while the modal mass reach only 70&( it should be modal mass??)

So can Anyone summarize the differences between them in in etabs?

RE: modal Mass participation ratio vs modal load participation ratio difference

Since noone smarter than me replied - Let me chime in:

Did you input foundation beams/slabs in your model?

If yes - Thats your problem - Those massive concrete blocks with supoorts applied directly on them cannot be engaged with your standard 10-20 modes of vibration. Try modeling without them - only line/point supports in the base of your walls/columns.



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