Answer:
In order to create a temperature load on a member via the COM interface, simply use a member load with the following parameters:Dim memload As RSTAB8.MemberLoad
memload.Direction = LocalZType
memload.Distribution = UniformType
memload.Magnitude1 = T_c
memload.Magnitude2 = dT
memload.ObjectList = "1"
memload.Type = TemperatureType
In this case, T_c corresponds to the constant temperature component and dT to the different temperatures on top and bottom.