STAAD.Pro HelpModelingM. Loading Your ModelM. Mass Modeling M. Mass Modeling M. Rules Used for Generation of Mass ModelsThe following rules are applied by the program when the Mass Model Generator tool is used to create equivalent mass loads from gravity loads.M. To generate a mass modelTo automatically generate from existing primary load cases or reference load definitions, use the following procedure.M. To add a mass model reference loadM. To add mass loads to the mass model reference loadParent Topic: M. Loading Your Model