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If X or Y or Z is specified for direction, then,
a) a spring support is generated in that direction b) the other two translational directions are fully restrainedc) the associated rotational degre of freedom is fully restrainedd) the other 2 rotational degrees of freedom are treated as unrestrained
Example :
plate-list PLATE MAT DIR Y SUBGRADE 0.4
FX is fixedFY gets a springFZ is fixedMX is freeMY is fixedMZ is free
If XONLY or YONLY or ZONLY is specified, then, a spring support is generated in that direction. All the remaining 5 degrees of freedom are treated as unrestrained.
plate-list PLATE MAT DIR YONLY SUBGRADE 0.4
FX is freeFY gets a springFZ is freeMX is freeMY is freeMZ is free