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Thank you,Avytin.You are quite right that the nodes on the surface of up element should be constrainted,and i do constraint these nodes,but my model still doesn't work right,so i constraint all the node s of up element,then my procedure works well.So what's problem with my model? Avytin, I have read...

Thank you, Frank.I have considered you suggestion seriously, i find if i restrain the 3rd dof of the nodes of quad UP element(the soil model in my procedure is 1D),then my procedure works well.But what i want to model is partial drainage,so the 3rd dof can not be restrained.Besides,if i change the s...

I am just doing a seismic analysis of pile group in liqufiable site,i use quad UP element to model soil and zeroelement to model soil-pile interaction,the zeroelement link node of piles and the dummy node(3dofs) then I connect quad UP element nodes with the dummy node,after all are done,i begin to a...