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.
-
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:
-
select a load case or reference load case on the right and click
> to add it to the notional load
-
click either
>> to add either all of the load cases
or reference loads to the notional load
-
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.