PDelta Geotransf

[schoolstru]

dear all
would you please tell me that is it possible that we use
geomTransf PDelta %d
in the column with zerolenght element in the column?
i mean that i have a column element that has concentrated plastic hinge at the both ends and this columns has also elasticBeamColumn
i have a model as i said first time the geomTransf commands was linear for both columns and beam and my model worked, but the second time i changed geomTransf commands from linear to PDelta, but this time the eigen analysis did not work for my model,
please answer me if you could
many thanks

[schoolstru]

and when i changed it from Pdelta to corotational it works,
does every body know why this happens?
and another matter is that does corotational trnasformation include both Pdelta and linear?

[fmk]

no reason it should not work assuming you have it correct.