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From the deformation plot, you can see there are some spurious displacements in the slender vertical members. This occurs when long slender members are meshed with only one element through the thickness. The problem can be reduced by changing ETCON,SET (default) to ETCON,OFF with a command snippet, when midside noded elements are used. If possible, use elements with dropped mid-side nodes for slender sections with one element through the thickness.
The spurious displacements are known as hourglass modes, which can occur when uniform reduced integration is used for SOLID186 (KEYOPT(2)=0).
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