The LoadCase object represents a single load case within a model of a frame.  This object contains the properties that are used to access the name and type of the load case.  It also contains four collections, one for each of the loading types, which contain all of the loads applied as part of this load case.  The LoadCase object also contains a list of load case factors which are only relevant if the load case is a combined load case.  Similarly, the accelerations associated with self-weight load cases are also stored within the LoadCase object.

The NodeLoad, NodePreDisp, ElementLoad or ThermalLoad objects describe each of the different types of loads that can be applied to a model.  As mentioned above, the loading objects describing all of the loads applied within a load case are available via the collections contained within the LoadCase object.

The NodeLoad and NodePreDisp objects described the force and prescribed displacement loadings that may be applied to a node within the frame. These objects provide details of which node the load is applied to, its magnitude, direction and well as which coordinate system in which the load is applied.

The loads applied to an element are described by either the ElementLoad or ThermalLoad objects.  These objects describe the element to which the load is applied, its magnitudes, direction and well as which coordinate system in which the load is applied.  Note that the ElementLoad object is used to describe both concentrated and distributed loads applied to an element.