This option defines uniform loads applied to structure bars. Open the Uniform Load dialog by clicking 
on the Bar tab in the Load Definition dialog.
You can define uniform loads applied to a structure bar and acting in the X, Y, or Z of the global or local coordinate system in this dialog. Also, you can specify the angle at which a load acts. You must also decide whether the load should be projected. If so, the load is applied to the bar's length projected on the plane that is normal to the load's direction.
A uniform load acts along a longitudinal bar axis. To define loads acting in points that are not along a longitudinal bar axis, you can define a load eccentricity in relation to the longitudinal bar axis.
Click Load on eccentricity to define a distance of a uniform load from the longitudinal bar axis. If Load on eccentricity is not selected, loads are defined along the longitudinal bar axis.