To Specify External Loads for an Analysis
For this procedure you must be on the External loads tab of the Analysis Definition dialog box. All loads that exist in the model at the time that you define the analysis are listed on this tab.
1. To include an external load, choose from the following options:
◦ Select an existing load and click 
to add another instance of the load.
to add another instance of the load.◦ Click 
to add all loads available for your model.
to add all loads available for your model. | Select one or more rows and click  to remove undesired loads. |
2. To change the time at which an external load will be active, select a load from the list and click the area under From or To to edit the times.
3. Click the name of any load in the list. Select another load if you want more than one instance of an external load, where the instances are active for different times in an analysis.
4. Accept or clear the check box for Enable gravity. For additional information on applying gravity, click the About Gravity Related Link below.
5. Accept or clear the check box for Enable all friction.
6. Click Run to run the new analysis or click OK to accept the analysis definition and run it later.