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Stiffness Auto Tuner

Overview

Beam / Wall Stiffness Auto Tuner is a plugin that supports automatic adjustment of the Element Stiffness Factor for selected beam elements and the Wall Stiffness Factor for wall elements.

Based on user-defined conditions, the plugin repeatedly performs analysis and design checks, verifies whether the member check ratio satisfies the target ratio set by the user, and then updates the Stiffness Factor according to the defined stiffness reduction sequence.

This helps reduce the repetitive manual work of modifying the Stiffness Factors of beams and walls and re-running the analysis. The final applied stiffness condition can also be reviewed directly in the MIDAS model.

 

Development Environment

  • MIDAS GEN NX 2026 V105 R1 KR

 

Applicable Standard

  • KDS 41 20 2022 RC
    • Beam check: Uses Beam Check results
    • Wall check: Uses Wall Design results

 

Plugin Benefits

  • Automatic iteration: The plugin repeatedly performs analysis, retrieves design results, and updates the Stiffness Factor based on the target ratio set by the user.
  • Model-based element selection: Target members selected in MIDAS GEN NX can be directly synchronized with the plugin.
  • Control over the Stiffness Factor sequence: Users can set the stiffness reduction interval and directly configure the stiffness reduction sequence to be used for iterative analysis by adding or deleting required values.
  • Automatic group creation: For beam elements, once the final analysis is completed, Element Groups are automatically created based on stiffness. For example: AutoTuner_Beam [0.80] [ Node=0 ; Element=4 ]

 

How to Use

  1. Run the plugin and select the task to perform. To adjust beam elements, select Beam Stiffness Tuner. To adjust wall elements, select Wall Stiffness Tuner.

  2. Select the target members in the MIDAS model, then click Sync from product. For beam stiffness adjustment, the currently selected beam elements are imported. For wall stiffness adjustment, the selected wall elements can be organized based on Wall ID and story information.

  3. If necessary, members assigned to a specific Section or Wall ID can be selected in bulk.

  4. This option is used to consider the Section Stiffness Factor already applied to beams. When this option is enabled, the analysis and design are performed based on the lower value by considering not only the Element Stiffness Factor but also the existing Section Stiffness Factor.

  5. Set the Decrement Stiffness Step Value. The plugin generates a stiffness reduction sequence from 100% down to lower values according to the specified interval. The generated values are displayed in the Stiffness decrement sequence.

  6. When a value is entered in Value to insert, the entered value is added to the Stiffness decrement sequence.
  7. Value to delete is linked with the values in the Stiffness decrement sequence. Select the value to be deleted to remove it from the sequence.
  8. Enter the Iteration Number and Target Ratio. The Target Ratio is the design ratio threshold used to determine whether additional stiffness reduction is required.

  9. Review the final result dialog. The results summarize members that still exceed the target ratio, members that have reached the minimum stiffness limit, and the final stiffness values applied to the selected elements.

  10. Once the final iteration is completed, stiffness groups are automatically created in the MIDAS model, and the selected elements are assigned to the corresponding groups based on their final stiffness ratios.

  11. Click the Back button to return to the main page where you can select either the beam or wall stiffness tuning plugin.
  12. The Refresh button updates the plugin with the latest information when a model has been newly opened or when model information has changed.

 

Conclusion

  • This plugin provides a workflow for automatically adjusting beam and wall stiffness factors based on iterative analysis and design check results.
  • It connects member selection, stiffness reduction sequence setup, target ratio input, and automatic group assignment into a single workflow, reducing repetitive manual tasks required for stiffness adjustment.
  • Users should use the generated stiffness values as part of the design review process and verify that the final model behavior satisfies the project requirements.
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