STAAD.Pro Help

M. To assign member imperfection for members

To assign member drift or camber for use with an imperfection analysis, use the following procedure.

  1. (Optional) Select the members which will all have the same member specification assigned.
  2. On the Specification ribbon tab, select the Beam > Imperfection tool in the Specification group.

    The Member Specification dialog opens to the Imperfection tab.
  3. 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)

  4. 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).
  5. (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
  6. 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.