This is the final screen in the tab series and is a unique feature available only in Substructure. Here, you can design and analyze multiple footings or footing types for each column, to include single spread footing under all columns, isolated spread footings under each column, single pile/shaft cap under all columns, and isolated pile/ shaft cap under each column. You can also check overturning from this tab. For more details about that, refer to Overturning Check Screen.

Program can check cracking and fatigue for load factored or LRFD designs if service and fatigue load groups are also included in analysis. Program performs this only if check for Cracking box is selected on this dialog. If this box is not selected, program does not check for cracking and fatigue in footing.

To automatically generate the footing reinforcement, click Auto Design to activate the Design Footing screen. Select the bar size and stirrup size from the list and click OK. The program will automatically generate the footing reinforcement and immediately display the Footing Design Results screen. To close this screen and return to the Combined Spread Footing Design screen, click Close. The reinforcement will appear in the list under Reinforcement.

To manually input the reinforcement, input the values in the text boxes under Reinforcement and click Add. You can enter bars that extend to only a portion of the footing by inputting the starting bar location in the From text box and ending location in the To text box. To modify existing reinforcement, highlight it in the list, make the appropriate changes, and click Modify. You can delete existing reinforcement by highlighting it in the list and clicking Delete.

Click the Design Status button to display the Footing Design Results screen. To print the summary, click Print.

For the structural design of spread footing, there are two options for the design soil pressure. The first option computes the maximum soil pressure from the controlling load combinations and uses the design calculations. The second option allows the user to specify the soil pressures manually. When this option is selected, all the design calculations (flexure, cracking, fatigue, one way and two way shear) are calculated using the specified values.