Interactive Column Design dialog

Tekla Structural Designer
2020
Tekla Structural Designer

Interactive Column Design dialog

The Interactive Column Design dialog shows the current reinforcement and check results for each stack in the selected column. When any of the editable fields are changed, the checks are re-run and the results are updated; enabling you to quickly see the effect of each change you make to the reinforcement.

To display the dialog:

  1. Right click on an existing concrete column.
  2. In the context menu, select Interactive Design....

The dialog content is described below.

1. Column/stack summary pane

The top row in this pane shows the column summary, consisting of the overall utilization ratio and design status.
  • With this row selected you can edit the section size and grade for all stacks simultaneously.
Subsequent rows show the design status of each stack and associated utilization ratio.
  • To design a particular stack, click on the corresponding row in the summary pane.

2. Longitudinal tab

All straight-edged cross sections have “Principal” bars located at shear tie corners. Between these, evenly spaced identical “Intermediate” bars can be located. Circular sections have 6 or more evenly spaced bars around the edge of the section.

  1. Longitudinal Bars:

    • Principal bar size: Used to change the size of all principal bars.

      • Use 2nd layer: Check the box to allow a second bar layer if required.

        • Spacing: For circular sections the user can control the layer spacing.
    • Intermediate bar size: (Not displayed for circular columns) Used to change the size of all intermediate bars.

  2. Bar Location Table: Used for adding intermediate bars into the cross-section:
    • Int. length - identifies the edge along which the bars are positioned
    • Count - for changing the number of intermediate bars along the length
    • Ctr spacing - the centerline spacing for the current number of bars along the length
    • Status - indicates when the maximum bar spacing limit has been exceeded. (When the minimum bar spacing limit is exceeded this is displayed elsewhere in the Design Summary Table).
  3. Design Summary Table: Displays the most critical result from all combinations:
    • Design and Resistance Moments and Moment Ratios
    • Axial Force, Axial Resistance and Axial Ratios
    • Smallest clear bar spacing
    • Minimum area of steel
    • Area of steel provided
  4. Section Droplist: Used for changing the section size for the current stack.

    Note: If the droplist is used to change the section shape an autodesign is performed.
  5. Concrete Droplist: Used for changing the concrete grade for the current stack.

  6. Confinement status : This status is determined based on the requirements for bars being tied.

  7. Cross-section : The drawing displays:
    • Exact bar positions (drawn to scale)
    • Tie locations
    • Section dimensions
    • Principal bar labels

3. Links/Ties tab

  1. Links:

    • Use support region links/ties : Select to design support regions for the links/ties.

    • Link/Tie spacing : Specifies the link/tie spacing (if support regions are applied two different spacings can be specified)

    • Link/Tie size: Used to change the size of link/tiebars (all must have the same size).

  2. Link/Tie Design Summary Table: Displays the most critical result from all combinations:
    • Region length
    • Link/Stirrup area over spacing required, major
    • Link/Stirrup area over spacing required, minor
    • Link/Tie area over spacing provided
    • Link/Tie utilization ratio
  3. Section Droplist: Used for changing the section size for the current stack.

    Note: If the droplist is used to change the section shape an autodesign is performed.
  4. Cross-section : The drawing displays:
    • Exact bar positions (drawn to scale)
    • Link/Tie locations
    • Section dimensions
    • Principal bar labels

4. Interaction Diagram tab

  1. N-M Interaction diagram : Top, mid fifth and bottom moment results for each analysis type are plotted on the diagram for each combination
    • The curves for bending about the major axis are shown in red
    • The curves for bending about the minor axis are shown in blue
  2. M-M Interaction diagram : The diagram is different for each value of axial force. Initially the diagram at the axial force of the critical combination is drawn - this is the combination with the highest MEd / Mres ratio.

  3. Parameters: Select the analysis method, combination, and position for which the diagrams are displayed.

    • Set Critical button: If you have changed the parameters for which the diagrams are displayed, you can click this button in order to revert back to the critical parameters.
  4. Design Forces: The design forces applicable for the selected parameters.

5. Additional Design Cases tab

This tab can be used for example to design for results from Post Tensioning analysis programs.

  1. Design cases...button: Click to open a dialog in which to add any additional design cases.

    The design case names defined here are available to all columns and walls in the model.

    The Active box in this dialog is used to control which design cases are considered (for the entire model).

    After clicking OK you are then able to specify the design case design forces in the Design cases table.

  2. Design cases table: Each design case added via the Design cases... button appears in the table, but only those that were marked as active (for the entire model) are then available to have design forces applied.

    In order to apply the design case design forces to a given stack you must:
    • Select the required stack in the stack summary
    • Click the Active box for the design case
    • Enter the design forces
  3. Design Moment Factors... button: Offers three potential “Design Moment” adjustments for each direction:
    • Set an imperfection eccentricity allowance (Eurocode only). This is added to the analysis moment.
    • Apply an amplification factor to allow for Second Order Effects (could also be considered as a way to introduce an extra factor of safety).
    • Apply a minimum moment check in one or both directions (the calculation of this is specific to the Head Code set and is a function of the section dimension “h” in the direction considered).

    When applied, the resulting adjusted design moment is automatically calculated and displayed in the dialog.

    The adjustment values and options can be applied to individual Cases and also quickly in a single operation to all Active Cases (those with “Active” option checked on) as shown below:

6. Buttons

Button Description

OK

Saves the current reinforcement and closes the dialog box.

Cancel

Closes the dialog box without saving changes.

Check...

Opens the Results dialog box that displays the detailed results for the current design.

Autodesign Stack

Performs an autodesign reselecting bars for the current stack

Detail Drawing

Creates a detail drawing for the selected member

Drawing Options

Opens the DXF Export Preferences dialog

Copy

Opens a new dialog enabling the selective coping of section/concrete grade/reinforcement from the selected stack to other stacks in the same column.
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