Seismosoft | Earthquake Engineering Solutions

Hi,
can I plot "Residual displacement response spectrum" for a given record by seismosingnal ?

Hello bakhtiyar.

While you cannot generate automatically a residual displacement spectrum, you may certainly obtain the residual displacement for a given record at a specified period and ductility by first generating the inelastic displacement spectrum for the said ductility:

Elastic/Inelastic Response Spectra --> Constant Ductility Inelastic

Notice next that you may obtain the displacement response history versus time for any desired period within the spectrum range:

Elastic/Inelastic Response Spectra --> Response Time Histories

You may then both observe (from the graph) or read (from the values) the residual displacement at said period.

Note that you may have to pad the end of your input acceleration history with zeroes at the end to obtain an accurate estimate of residual displacement, though this is not always necessary.

That would be a neat feature to have bakhtiyar. Perhaps you might request it in SeismoSignal forum Section 04 - future developments and requests.

Best of luck bakhtiyar.

Dear huffte tanks.
I want residaul displacement spectra for pulse-like grouand motion.
What software is constant strength for calculate ductility spectra?

Three options for constant strength inelastic displacement spectra are BiSpec,NSPECTRA, and NONSPEC:

http://peer.berkeley.edu/products/bispec.html
http://civil.eng.buffalo.edu/nspectra/
http://nisee.berkeley.edu/elibrary/Software/NONSPECZIP

You might try those out. Unlike Seismospect, BiSpec is very expensive, though you may be able to accomplish your goals with a trial version. NSPECTRA is much less user friendly than Seismospect. It is , however, free. The same for NONSPEC.

So if you truly need constant-strength inelastic displacement spectra, you could try one of these.

Best of luck with your work.