M. To add a notional load case
To add notional loads to a load case for use with direct analysis, use the following procedure.
Notional loads are
lateral loads which are defined as a small percentage of gravity loads.
Therefore, you must define your gravity loads in a separate reference load case
(recommended) or primary load case before adding notional loads.
The notional loads
are calculated as lateral loads applied to the joints in the selected global
direct.
-
Either:
The Add New Load Items dialog opens.
On the Loading ribbon tab, select the Load Items tool in the Loading Specifications group
Tip: This will add the load item to the currently selected load group selected in the program status bar.or
In the Load & Definition dialog, select a primary load case in the Load Cases Details list and then click Add.
- Select the tab. Two load lists are displayed. The first is a list of primary load cases which occur before the current primary load case and the second is a list of reference load definitions.
- Either:
- Type a Factor to use for the ratio of lateral to gravity loads for each load case added to the notional load. Typically, codes recommend 0.2 to 0.3 % (0.002 to 0.003). The default value will be the Notional Load Factor specified in the Direct Analysis Definition.
- Select the global Direction for each load case added to the notional load.
- Click Add.