To assign member drift or camber for use with an
imperfection analysis, use the following procedure.
- Optional:
Select the members which will all have the same member
specification assigned.
-
On the
Specification ribbon tab, select the
tool in the
Specification group.
The
Member Specification dialog opens to
the
Imperfection tab.
-
Do either of the following:
- select
Camber to define the maximum offset along a
beam from a line connecting the end points (typically for beams)
- select
Drift to define the offset at the end of a
member (typically for columns)
-
Select the
Local Direction of the imperfection and then
type the
Value, which is taken as a ratio of the member
length to offset (i.e., L/d).
- Optional:
For Camber, type a
Respect value which is used to determine when
to skip camber imperfection calculations.
This ratio results in the camber imperfection
calculations being skipped when:
- the compressive load is small,
- the member stiffness (EI) is large, or
- the member is short
-
Either:
To… | Do the following… |
---|
add the specification to
the model and assign to the current member selection |
click
Assign. |
add the specification to
the model for later assignment |
click
Add. |
The dialog closes.
You must assign the member imperfection specification to one or more
members. An imperfection analysis is required in order to perform these
calculations.