This screen appears if you selected the LFD design code. Here you can modify or review the strength reduction factor, crack control factor, reduction in live load intensity, clear concrete cover, and impact factors.

For slender columns, you can select the P-* delta Method check box under Column Slenderness Consideration. You can assign up to thirty iterations. It is recommended to use minimum of three iterations. Note that, program execution time exceeds with more number of iterations. If you do not select the P-* delta method, you can use the moment magnification method (on the Column screen) to design the slender column. If you have an unbraced column and want to use the moment magnification method, specify the value for degree of fixity in foundation (under Column Slenderness Consideration). Substructure uses this value to calculate the effective column length factor, k.

Substructure follows two different algorithms to generate load combinations. If you selected the Use Cross Combinations check box, the program will generate comprehensive load combinations. If not selected, the program will use the concept of load dependency to generate the combinations. In this case, the number of combinations will be less than if you selected the Use Cross Combinations check box. See page TH-31 in the Theory chapter for more information. Program now allows you to view or modify the dependency. To do this, you may click the Dependency Table button.

Other two options on this dialog allows you to do the cap and footing design for the magnified column moments at the cap-column or column-footing connection. If you would like do this, check the appropriate box. However, for that case, you should first do the design of all the columns with magnified moments and then do the design of cap or footing.

Clicking on the Seismic Design Parameters button opens another dialog on which parameters related to seismic design may be specified.