Column Tab
The Column Tab is used to specify the reinforcements for the different columns of the pier structure.
To start, select the column of the structure you want to design from the Columns # list and the type of stirrup (ties or spiral) from the Lateral B Substructure does not determine if a column is braced or unbraced.
Either manually input the reinforcement for the selected column or click the Auto Design button to have the program automatically design the selectear Type list. Under Moment Magnific, if you want to use the moment magnification method (MM) for the selected column, select the Consider MM check box. If selected, specify if the column is braced or unbraced.d column.
Click Auto Design to open the Design Column screen. Select the bar size and tie/spiral size from the lists and click OK. of the screen.
When Auto Design is done Substructure resets the Rebar Pattern to rectangular for all column shapes except cSubstructure will automatically design the selected column and display the design status before returning to the Column screen. Then, the required reinforcement will appear in the list at the bottom ircular and octagonal columns. For circular and octagonal columns, the pattern is reset to circular. Rebar orientation is reset to face parallel.
To manually input the reinforcement, first select the rebar pattern. Depending upon the column shape, Substructure allows rectangular, circular, intersecting hoops and general rebar pattern.
If the rebar pattern is rectangular or circular select the rebar orientation. Substructure allows bars to be either vertical or face parallel. For face parallel bars, the cover remains constant at all locations. Intersecting hoops and general pattern allow only vertical bars.
After selecting rebar pattern and orientation, enter the values in the text boxes at the bottom of the screen and click Add. You can modify existing reinforcement in the list by highlighting it, making the appropriate changes, and clicking Modify. To delete an existing reinforcement, highlight it and click Delete. A maximum of two layers of reinforcement steel are allowed in the column design for circular or rectangular patterns.
A valuable timesaving feature available is Copy From. Clicking this button will copy the reinforcement from another column to the selected column. Simply, click Copy From to activate the Column Copy From screen shown below.
Select the column you would like to copy the reinforcement from and click OK. It now appears in the list on the Column screen.
Once the reinforcement is entered, an updated view of the component will be displayed in the top portion of the screen. You can click Design Status to display a design summary of the selected component. To print the summary, click Print. Clicking Sketch displays a graphical representation of the selected columns with reinforcements.
Clicking Parameters activates the Moment Magnification Parameters screen shown below. This button is only enabled when you select the Consider MM check box. If you do not want the program to calculate the effective length factor (k), then you can manually input the value for k in the X and Z-directions.
You may include shear design for columns. Circular column is designed for one-way bending combined with axial compression, and the design process is done in the resultant direction of the transverse and longitudinal directions. For other column shapes, they are still designed for one-way bending combined with axial compression, but the design process is done in longitudinal and transverse directions, respectively.