T.3 Specifying load groups 1 and 2

On the Spreadsheet ribbon tab, select the Load Cases tool in the References group.

The Load Cases spreadsheet opens.
For Load 1:
1. Type Dead Load in the description field of Load case 1.
2. Select Dead as the Type.
3. Type -1 in the Self-weight multiplier in field Y.
  Note: This value is negative.
4. Press <Enter>.
Create a load group for the external pressure load:
1. On the Model ribbon tab, select the Load Case tool in the Load group.
  
  The Add Load Case dialog opens.
2. Type External Pressure Load in the Name field.
3. Select Floor Unspecified as the Type.
4. Click OK.
The new load group is created and selected as the active load group.
On the Surface Tools ribbon tab, select the Pressure tool in the Loads group.

The Add Surface Uniform Pressure dialog opens.
Specify the pressure load:
1. Type -300 kg/m2 in the Pressure field.
2. Select Global Y as the Direction.
  Tip: Since the surface is parallel to the XZ plane, you could also have selected local 3 as to achieve the same direction. However, due to the counterclockwise selection of nodes, the local 3 axis is oriented in the opposite direction of the Global Y. Therefore, you would use a positive magnitude for that case.
3. Click OK.

The temperature load must be added directly to the analytical model in the STAAD.Pro interface. This is done after you generate the analytical model.