I/O Options and Subcase Information Entry Used to request applied load vector output temperature load output, and applied power output for all subcases or individual subcases, respectively.

It can also be used to request applied charge output for Structural Analysis with piezoelectric materials. For more information, refer to Piezoelectric Analysis in the User Guide.


OLOAD (format_list,type,spc, SUBSYS, NLOUT) = option


Argument Options Description
format <H3D, OPTI, PUNCH, OP2, HDF5 , blank>
Results are output in Hyper3D format (.h3d file).
Results are output in OptiStruct results format (.load file).
Results are output in Nastran punch results format (.pch file).
Results are output in Nastran output2 format (.op2 file). 7
Results are output in the Hierarchical Data format, Version 5 (.h5 file). 7
blank (Default)
Results are output in all active formats for which the result is available.
type <SPARSE, ALL>

Default (OPTI) = SPARSE

Default (H3D, PUNCH, OP2) = ALL

This is only available for the OPTI output format. Output for selected nodes without a component of magnitude 1.0e-10 is not printed.
Output for all selected nodes is printed.
spc <NOSPC, SPC> Only supported for Linear Static and Nonlinear Static Analysis. It will be ignored, if specified in other subcase types.
NOSPC (Default)
Applied force on SPC degrees of freedom is printed as zero in OLOAD output.
Applied force on SPC degrees of freedom is retained and printed in OLOAD output.

No default

ID of the subsystem.

When used along a subsystem definition, this option generates an individual result file for each subsystem with results for that subsystem only.

For more information, refer to the SET Bulk Data Entry.

No default

ID of the NLOUT Bulk Data Entry.

For more information, refer to Comment 3 in the NLOUT Bulk Data Entry.

option <YES, ALL, NO, NONE, SID>

Default = ALL

YES, ALL, blank
Load data is output for all nodes.
Loads are not output.
If a set ID is given, load data is only output for nodes listed in that set.


  1. When OLOAD command is not present, loads are not output.
  2. Multiple formats are allowed on the same entry; these should be comma separated. If a format is not specified, this output control applies to all formats defined by the OUTPUT command, for which the result is available.
  3. Multiple instances of this card are allowed. If instances are conflicting, the last instance dominates.
  4. For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT.

    In previous versions of OptiStruct, a combination of the I/O Options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.

  5. Applied Temperature Loads are output in conjunction with the applied load vectors, if OLOAD I/O Options Entry is specified. The temperature loads are output in H3D format. The results are displayed under the "Applied Temperature(s)" label in HyperView.
  6. The SPARSE output type is only available when the OPTI output format is used.
  7. format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).

    The HDF5 output is printed to a .h5 binary results file. For details of the supported analysis types and elements when the .h5 output format is requested, refer to the .h5 file.
  8. Applied Power output is available only for Steady-State Heat Transfer Analysis in H3D and PUNCH files only.
  9. Incremental temperature field output for Nonlinear Analysis is available in H3D files only.
  10. In case of electrical analysis, OLOAD can be used to output applied nodal current results. Currently, results are available only in the .h3d format.
  11. For inertia relief analysis, the output of inertia-relief-corrected loads can be controlled using PARAM, INRELOUT.
  12. OLOAD output is also supported for applied load output on fluid grids via ACSRCE. This is output as Applied Forces (Grids) in H3D, OP2, and PUNCH formats.
  13. Applied temperature load output is also available in the HDF5 format for linear static analysis. If other loads are applied in addition to Temperature loads, they are output as well.