Many codes have multiple sets of load combination rules for various cases and structures. Select the category for the selected code from this list. "Category" stands for the various sub-tables we wish to associate with the selected code (e.g., one table for loads on office buildings, another for transmission towers in coastal regions, another for power-plant structures, etc.).

Displays the rules associated with the selected code and category.

Rows in the table typically represent a single load combination rule (the first two rows are special instructions for how each load type should be handled).

• Include Notional Load? - Select this option for each load type to include Notional Load cases in the generated combinations, if they are present in the input file. These loads are used for direct analysis.
• Combination Rule - As some load types can result in different actions, a single rule may result in multiple load combinations (i.e., wind or seismic acting in positive or negative directions). The combination rule directs the program how to handle such cases:
  • Combine all cases together - For each rule, a single combination will be created which will include all the load cases of that load category multiplied by the factor in the table.
  • Separate combination for each case - For each rule, multiple combinations will be created, each will include one of the load cases of that load category multiplied by the factor in the table.
  • All possible combinations - For each rule, multiple combinations will be created which will include each of the load cases of that load category on their own and with each and every other load case of that category multiplied by the factor in the table.

  Examples of each combination rule are below.

• Rule No. - The multiplying factor for each load type for the rule is displayed and may be edited (blue text in a white cell). Load Types with no factor associated with the rule are displayed in yellow cells.

Columns in the table represent load types.