Seismic Analysis
Seismic Analysis
(OP)
I am doing seismic analysis using ANSYS 5.7.
After doing response spectrum analysis to find responses(displacement and stresses)for three INDIVIDUAL spectra (say in X,Y ,and Z directions)using SRSS mathod of combination,how to get the COMBINED RESPONSE DUE ATO ALL THE THREE SPECTRA ?How to proceed in the Postprocessor?please help.
Thanks in Advance
brc01
After doing response spectrum analysis to find responses(displacement and stresses)for three INDIVIDUAL spectra (say in X,Y ,and Z directions)using SRSS mathod of combination,how to get the COMBINED RESPONSE DUE ATO ALL THE THREE SPECTRA ?How to proceed in the Postprocessor?please help.
Thanks in Advance
brc01





RE: Seismic Analysis
This is infact a question back to you. I have a similar problem now. I saw your question when I was searching for seismic analysis.
As far as I know it, the 3 directions are independent in terms of the response and has to be given as such. I've no knowledge of any combination of the 3 response spectra.
In case the 3 have to be combined and there is a way to combine the 3, please let me know.
Thanks in advance,
jharish
RE: Seismic Analysis
Well,COSMOS uses "SRSS:Square root of sum of squares"method to combine these responses to get the net response.I am not sure if anything similar is there in ANSYS.
RE: Seismic Analysis
RE: Seismic Analysis
Hope this helps.
-Harish-
RE: Seismic Analysis
lcoper,srss,all
command (subsequent to setting the three loadcases as a loadcase definition - lcdef).
RE: Seismic Analysis
Ordinary loads and reactions can be combined using the SRSS method. But my question is whether the same procedure can be followed for a seismic analysis. I'm questioning this as all the test reports I've seen come with separate response curves for the 3 mutually perpendicular directions. So the question still stands... Can it be done for a seismic analysis. Sorry for being so persistent, but it's vital for me.
Thanks.
-Harish-
RE: Seismic Analysis
Hope this helps i happy ANSYSing
- - D R E J - -
RE: Seismic Analysis
Hope this helps - happy ANSYSing
- - D R E J - -
RE: Seismic Analysis
I am doing similar analysis.
Can any body help me as what exactly to look for in Seismic analysis for PSD input viz. the displacement or 1 sigma stress. Also when I go for /post26 my screen shows that the initial memory allocation has been exceeded and the ansys window goes off. I am using Ansys 7.0.I have 108000 elements in all.Has anybody faced a similar kind of problem?
Thanks in advance.
Bhawesh.