Applies To
	Product(s):	STAAD.Pro
	Version(s):	ALL
	Environment:	ALL
	Area:	Analysis Solutions
	Subarea:	Dynamic Analysis
	Original Author:	Sye Chakraborty, Bentley Technical Support Group

 

I am getting a note in my analysis output as shown next

 

  *** NOTE: MASS MODEL FORMED WILL BE USED IN SEISMIC/RESPONSE/TIME HISTORY LOADING, IF ANY. IF MASS MODEL IS SEPARATELY PROVIDED IN INDIVIDUAL LOADING, THE GENERATED MASS WILL BE REPLACED BY THE MASS PROVIDED IN INDIVIDUAL LOADING.

 

What does that mean ?

 

The note is a standard note which is output when a mass type reference load is specified.

 

STAAD.Pro uses the mass, defined as part of a mass type reference load case, as the dynamic mass for response spectrum or time history load or as seismic weight for equivalent static seismic loads. However if the user separately specifies the seismic weight as part of the seismic definition or specifies the seismic mass separately as part of a response spectrum or time history load case, then the later would be used as seismic weight/mass as opposed to the mass defined as part of the mass type reference load.

 

The note simply explains this software behavior.