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it's better to say my question in this way : I have studied this paper "Boulanger, R. W., Curras, C. J., Kutter, B. L., Wilson, D. W., and Abghari, A. (1999). "Seismic soil-pile-structure interaction experiments and analyses." Journal of Geotechnical and Geoenvironmental Engineering, ...

hi all
i want to know how opensees arrange springs and dash-pots in P-Y element that uses for BNWF modeling of PILE
element name is PySimple1
thank you

Thanks for your conceptual answer, you mean this is Try and Error procedure but how I can find Errors because in my model I try some systems and all of them seems works good !

which parameters affect on system ?
I am working on a offshore platform model in open sees how I can find Umfpack is better or SparseGeneral and whats different between these ?

Hi While I run my OpenSEES the command window shows this warning : WARNING: CTestNormDispIncr::test<> - failed to converge but going on - current Norm:1.17412e-006 <max: 1e-006, Norm deltaR:2.05105 Pleas help me to know, what is this warning ? Notice: However I see this warning appear while I runnin...