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STAAD Commands and Input Instructions
Section 5
5-144
5.26.6 Member Imperfection Information
Purpose
To define camber and drift specifications for selected members.
Drift is usually for columns and camber for beams.
General Format:
DEFINE IMPERFECTION
⎧ Y ⎫ * ⎧ XR f
4
f
5
⎫
CAMBER ⎨ ⎬ (f
1
) RESPECT (f
2
) ⎨ YR f
4
f
5
⎬
⎩
Z
⎭
⎪
ZR
f
4
f
5
⎪
⎪
MEM memb-list
⎪
⎪
LIST memb-list
⎪
⎩ ALL ⎭
⎧ Y ⎫ * ⎧ XR f
4
f
5
⎫
DRI
FT ⎨ ⎬ (f
3
) ⎨ YR f
4
f
5
⎬
⎩
Z
⎭
⎪
ZR
f
4
f
5
⎪
⎪
MEM memb-list
⎪
⎪
LIST memb-list
⎪
⎩ ALL ⎭
Where
f1 Camber value. Default = 300.
f2 Respect value. Default = 1.6 .
f3 Drift value. Default = 200.
f4 and f5 global coordinate values to specify X or Y or Z
range for member selection.
Imperfections will be simulated by loads. These loads will be
generated for the specified members if there is an Imperfection
Analysis specified and if the specified members are active, in
compression, and are not truss or tension/compression only
members.