Hi,
thanks for your nice tool, I really appreciated it.
I would like to ask if you checked the tosal mass when mass on element is used. I found a little difference between Sap2000 and your code.
have a nice day

Hey, I was just playing around with this today!
Looking at your code, I had a suggestion that could be used to cut down on some of the length.
You have two blocks of code nearly identical, except for the function they are using, e.g.

print('\nModal Periods and Frequencies')
f.write('Modal Periods and Frequencies\n')

Instead we could create a function called something like printModesData(Mratios, Mfactors, ...., printFunction = print)
This function would take in the print function you want, i.e. f.write or print.

 if outname != None:
    with open(outname+'.csv','w', encoding='utf-32') as f:
        printModesData(arguments,  printFunction = f.write)

....

if pflag == 1:   
    printModesData(arguments, printFunction = print)

There might be a few complications passing f.write - the actual file might need to be passed as well..

Just a thought.

Hi!

Thank you again for the very nice contribution.
I'm trying to implement the ModalAnalysis script for my specific software, and I cannot wrap my head around the loop from line 91 to 100.
I suppose the value of temp in Line 95 would be from 1 to 6, depending on the DOF numbering?

Wouldn't the if condition from Line 96 be run only once when the DOFs list is empty, i.e. the condition will only run on the first node in op.getNodeTags() and the ldict influence vectors will only be 1 at the first node?

I would really appreciate it if you could clarify this.

Thank you so much for your time.

I have a model where using the modal analysis script I got a different mass than expected.
I'm analyzing a floor plate, I expect my total mass to be ~9400kg. This is the sum of all of the masses I've applied.

However, when run the modal analysis, I'm getting a mass closer to 8000kg.

There could be something I'm missing - is this output expected to be the total mass?

For reference, here is my script
FloorPlate.txt