Generating extra joints with REPEAT または 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, 長方形の, hollow-rectangular and T shapes. Where only overall properties are given (変換されたセクションの結果とともに結果, 慣性モーメント) 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, まだ.

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 (傾いた) パネル, 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.