Problem with using brick8NupU and eightNode_Brick_u_p

[aminrahmani]

Hi,

My Thesis is on numerical modeling of Seismic behavior of a single pile in
liquefiable soils with OpenSees. My problem is I don't know which elements give me more accurate results (the constitutive model of the soil is Dafalias-Manzari) ? I mean the Brick8N_u_p_U or the EightNode_Brick_u_p ?

Furthermore, I used system BandGeneral command for static and dynamic analysis instead of system Umfpack. Is it right for the analyze of these elements?

I really appreciate your help.