STAAD.Pro Help

A. To specify a nonlinear analysis

To instruct the program to perform a geometric nonlinear analysis of the structure, use the following procedure.

Note: This requires a STAAD.Pro Advanced license.
  1. Either:

    select the Analysis page

    or

    on the Analysis and Design ribbon tab, select the Analysis Commands tool in the Analysis Data group

    The Analysis/Print Commands dialog opens.
  2. Select the Nonlinear Analysis tab.
  3. (Optional) Specify the nonlinear analysis parameters as necessary:
    1. Type a absolute displacement limit for the first analysis step in the ARC field.
    2. Type the maximum number of Iterations to use to achieve equilibrium in the deform position within the specified tolerance value.
    3. Type the Tolerance to use for achieving convergence between two sequential iterations.
    4. Type the number of Load Steps to use for applying load in stages.
    5. Type frequency of Rebuild Steps of the tangent K matrix.
  4. Check the KG option to add the geometric stiffness to the stiffness matrix.
  5. (Optional) Check the Set Displacement Limit option to specify a target displacement:
    1. Either:

      type a Node number

      or

      click […] to select a node in the view window

    2. Select a DOF (degree of freedom from the drop-down list).
    3. Type a Target Value distance for the displacement limit.
  6. Select the Print Option you want to use.
  7. Click Add. The perform nonlinear analysis command is added to the input file.