Form: Composite Column Design Information {Code}
Interactive composite column design allows design results for any frame element defined as a composite column (e.g., filled rectangle or pipe section) to be reviewed, the design overwrites to be changed interactively, and the results to be viewed immediately.
Access Interactive Design as follows:
Select the Analyze menu > Run Analysis command to analyze the model.
Select the Design menu > Composite Column Design > Start Design/Check command.
Right click on a frame element while the design results are displayed on it to enter the interactive design mode and interactively design the element using the Composite Column Design Information {Code} form. If design results are not currently displayed, click the Design menu > Composite Column Design > Interactive Design command and then right click a column to enter the interactive design mode for that beam.
Use the various areas of the Composite Column Design Information {Code} form to review the design:
Story display box. The story level ID associated with the composite column.
Column display box. The label associated with a frame element that has been assigned a composite column section property.
Section Name display box. The current design section property. The current element design is performed for the section property specified in this edit box.
Table Showing Reinforcement Information. This table shows the output information obtained for each design load combination at each output station along the composite column. For columns that are designed by ETABS, the item with the largest required amount of longitudinal reinforcing is initially highlighted. For columns that are checked by ETABS, the item with the largest capacity ratio is initially highlighted. Following are the possible headings in the table:
Combo ID: The design load combination considered.
Station Loc: The location of the station, measured from the i-end of the frame element, for the displayed results.
Longitudinal reinforcement: Applies to columns for which ETABS designs the longitudinal reinforcing. It is the total required area of longitudinal reinforcing steel.
Capacity ratio: Applies to columns for which the location and size of reinforcing bars have been specified and thus ETABS checks the design. This item is the capacity ratio. The capacity ratio is determined by first extending a line from the origin of the PMM interaction surface to the point representing the P, M2 and M3 values for the designated load combination. Call the length of this first line L1. Next a second line is extended from the origin of the PMM interaction surface through the point representing the P, M2 and M3 values for the designated load combination until it intersects the interaction surface. Call the length of this line from the origin to the interaction surface L2. The capacity ratio is equal to L1/L2.
Major shear reinforcement: The total required area of shear reinforcing per unit length for shear acting in the column major direction.
Minor shear reinforcement: The total required area of shear reinforcing per unit length for shear acting in the column minor direction.
Overwrites button. Click the Overwrites button to access the Composite Column Design Overwrites form. Use that form to make revisions to the concrete frame overwrites.
Summary button.
In the "Table Showing Reinforcement Information" area of the Concrete Column Design Information {Code} form, highlight the Station Location associated with summary data to be displayed.
Click the Summary button to display the Report Viewer and a summary of the design data for the highlighted section. The form has buttons to move through the pages of the summary, to Zoom into the individual report pages, print the report, and save it to the Word compatible format.
See Also