Abaqus solver problem (zero pivot)
Abaqus solver problem (zero pivot)
(OP)
I modelled typical 3D tunnel construction. The msg file showed "Zero pivot when processing D.O.F. 8 of 49 nodes." which is overconstraint problem, it said "There are multiple constraints applied directly or chained constraints that are applied indirectly at this node. A list of nodes and chained constraints between these nodes that most likely lead to the detected overconstraint can be printed out to the message file by including *constraint controls, print=yes in the input file."
My questions are about when I checked odb file, I found 49 nodes located inside the middle part of the clay ground model, what's the reason? And how to solve this bloody problem?
Actually I have tried many methods like changing boundary conditions and contact (node-to-surface), but still the same problem. Please help me! Many thanks!
My questions are about when I checked odb file, I found 49 nodes located inside the middle part of the clay ground model, what's the reason? And how to solve this bloody problem?
Actually I have tried many methods like changing boundary conditions and contact (node-to-surface), but still the same problem. Please help me! Many thanks!




