Generating extra joints with REPEAT ή REPEAT ALL isn’t supported yet. STAAD doesn’t document how it numbers the new joints, so rather than guess and risk incorrect geometry, these lines are skipped — you’ll see a note about it in the import log.

If a group is defined using one of STAAD’s shortcut forms (a keyword like ALL, or a bare axis letter), it can only be used after the whole import finishes — not by another command earlier in the same file.

A round hollow tube can’t be tapered, since Structural 3D’s Section Builder only allows tapering for I, ορθογώνιος, hollow-rectangular and T shapes. Where only overall properties are given (περιοχή, στιγμές αδράνειας) instead of dimensions, the section’s properties still come through correctly, but it won’t be drawable in the Section Builder.

Overriding a single member’s stiffness, density or other material properties (rather than assigning it a whole different material) is read but not applied — you’ll see a note in the import log for each one. Rotating a member to align with a reference point, joint or vector isn’t converted into a rotation angle yet.

STAAD’s torsional partial release has no equivalent in Structural 3D, so it’s treated as fully fixed. Where a partial release does map to a spring, only the fact that it’s a spring comes through — its stiffness value doesn’t, yet.

For cable members, only the member type comes through — its initial tension, length and self-weight factor don’t, since Structural 3D doesn’t yet have a matching field for them.

A moment or force applied about a member’s local Y or Z axis is approximated using only its local X axis — you’ll see a note asking you to double-check these. A trailing “perpendicular distance” value on these loads is read but not used.

A pressure load defined over only part of a plate (a partial or concentrated pressure) isn’t converted yet — you’ll get a note about it in the import log.

The alternative form that defines the load’s extent with coordinate ranges, instead of a floor group, isn’t converted yet.

The coordinate-range form, and a floor load on a non-horizontal (inclined) πίνακας, aren’t converted yet.

The reducible-load option, and the seismic form of a reference load, aren’t converted — both are noted in the import log.

A combination’s GENERATE instruction, and an overall scale factor at the end of an SRSS combination, are intentionally not applied — this matches how Structural 3D expects a combination to be defined, not a coverage gap.