Response spectrum - SRSS - negative values

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d.giaccone posted this 2 weeks ago

Dear all, I’m running a spectrum analysis with Ansys, and I found a stranger behaviour in final results. modeled a simple column, 30x30x300 cm, subject to its own load. I run a modal analysis, and then a response spectrum, using 4 shape modes and a SRSS combination mode. analysed Ansys results: as regard the deformation and the normal stress, Ansys results correspond with manually ones; as regard principal stress, on the contrary, I don’t obtain the same results. Moreover, I noticed that Ansys gives not only positive but also negative values, that is impossible according to the definition of the SRSS combination method itself. I tried also to repeat the analysis using another combining method (CQC) but the problem still exists. What can be the cause? Thankyou.

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peteroznewman posted this 2 weeks ago

It could help if you would attach the archive of your project to your post and say which version of ANSYS you are using.

d.giaccone posted this 2 weeks ago

I'm using ANSYS 18.0. How can I attach the file?

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peteroznewman posted this 2 weeks ago

In Workbench, save the project, then File, Archive... and create a .wbpz file.  If that file is < 120 MB, you can attach it using the Attach button on any of your posts.

If the file is > 120 MB, click on Model, Clear Generated Data, then save and archive to get a smaller file. Don't include results.

d.giaccone posted this 2 weeks ago

Ok, it was really a size problem 

Attached Files

peteroznewman posted this 1 weeks ago

I have downloaded your model and solved it, now I need some time to study RS analysis as your question is deep.

d.giaccone posted this 1 weeks ago

Ok, I will wait... thank you

d.giaccone posted this 3 days ago

Hi peteroznewman, you got some news?

peteroznewman posted this 3 days ago

Sorry, I have not had time to study this yet. I plan to do some this weekend.

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