*** ERROR *** CP = 80738.594 TIME= 16:17:36
The value of UZ at node 10 is 5.611152132E+37. It is greater than the
current limit of 1000000. This generally indicates rigid body motion
as a result of an unconstrained model. Verify that your model is
properly constrained.
*** ERROR *** CP = 80738.797 TIME= 16:17:41
*** MESSAGE CONTINUATION ---- DIAGNOSTIC INFORMATION ***
Rigid body motion can also occur when net section yielding has
occurred resulting in large displacements for small increments of load
or when buckling has occurred. You can plot the time history curve
for node 10 in the UZ direction to check for stiffness (slope of the
curve) approaching zero.