Damping in Response Spectrum Analysis
Damping in Response Spectrum Analysis
(OP)
Hey Guys,
I understand that during the analysis the response spectrum function will automatically adjust to cater for modal damping when the spectrum is defined as per a particular code that is built in.
https://wiki.csiamerica.com/display/kb/Damping+in+...
I would like to know if I will be able to input different spectra corresponding to various damping values through an input file so that modal damping can be done.
I understand that during the analysis the response spectrum function will automatically adjust to cater for modal damping when the spectrum is defined as per a particular code that is built in.
https://wiki.csiamerica.com/display/kb/Damping+in+...
I would like to know if I will be able to input different spectra corresponding to various damping values through an input file so that modal damping can be done.





RE: Damping in Response Spectrum Analysis
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RE: Damping in Response Spectrum Analysis
RE: Damping in Response Spectrum Analysis
But i think you guys are not clear with my query. What i wanted to know was if i could linearly interpolate between the two input response spectra that i have defined to get the required accelaration for a damping equal to the modal damping.
For Ex. I define a RespFunc1 corresponding to damping 5% and RespFunc2 corresponding to 10%. Now due to different materials used in the structure I m ending up with a modal damping of say 7%. So the acceleration that i need to consider is of a damping value of 7%. So will SAP consider the damping corresponding to 7% by any chance? or will I end up with a response acceleration corresponding to 5% (or10%) only.
NB : I am a frequent user of STAADPRO and there is a provision in it where i can input two spectrum for two different damping values and ask the solver to consider a linear interpolation between the input spectra.