| Applies To | |||
| Product(s): | STAAD.Pro | ||
| Version(s): | All | ||
| Environment: | N/A | ||
| Area: | Developing the Modeling FAQ's | ||
| Subarea: | Modeling | ||
| Original Author: | Bentley Technical Support Group | ||
When using the foundation support, I am required to give the subgrade modulus and supply a direction. I have always used Y as the direction. However, I am interested in knowing what would occur if I choose Y-only. Is there some type of weak spring placed in X & Z directions, is it completely restrained, or is it somewhere in between?
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 restrained
c) the associated rotational degre of freedom is fully restrained
d) the other 2 rotational degrees of freedom are treated as unrestrained
Example :
plate-list PLATE MAT DIR Y SUBGRADE 0.4
FX is fixed
FY gets a spring
FZ is fixed
MX is free
MY is fixed
MZ 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.
Example :
plate-list PLATE MAT DIR YONLY SUBGRADE 0.4
FX is free
FY gets a spring
FZ is free
MX is free
MY is free
MZ is free