# T.1 Creating Load Case 3

If you started your model in STAAD.Pro Physical Modeler, first select the Loading page in the Analytical Modeling page control bar. The Load & Definition dialog opens on the right side of the program window.

Here you will see that the two load groups you created inSTAAD.Pro Physical Modeler have each been added as primary load cases to the analytical model. The loads you added to the physical model are also transferred as load items in the respective load cases.

Load case 3 is a load combination. This means that the results from the primary load cases will be combined as directed by this load case definition.

The Create New Load Combinations dialog opens.
2. Type 75 Percent of [DL+LL+WL] in the Name field.
3. Set the Type option to Normal.

The other combination types available are called SRSS (square root of sum of squares) and ABS (Absolute). The SRSS type offers the flexibility of part SRSS and part Algebraic. That is, some load cases are combined using the square root of sum of squares approach, and the result is combined with other cases algebraically, as in:

$A + B 2 + C 2$
where
 A, B, and C = the individual primary load cases
4. Type 0.75 in the Default ɑ1 field.

This is used as the default factor for normal load combinations.

5. Click [>>].