|Shear||Rigid planar surfaces that inherently resist lateral thrusts of shear.|
|Bearing||Walls that support a vertical load in addition to their own weight.|
|Non-bearing||Walls that define and divide spaces and support no vertical load except their own weight.|
|Structural combined||Walls that serve more than one purpose.|
When you use the Wall tool, Revit LT assumes you are placing partition walls. Whichever wall type you select, the default Structural Usage value is non-bearing. When you use the Structural Wall tool, and select the same wall type, the default Structural Usage value is bearing. In either case, the value is read-only, but you can change it after the wall is placed.
Typical structural wall