Applies To
	Product(s):	STAAD.Pro
	Version(s):	All
	Environment:	N/A
	Area:	STAAD.Pro Analysis Solution
	Subarea:	Response Spectrum Analysis
	Original Author:	SANJIB DAS, Bentley Global Technical Support Group

The direction factor for IS 1893(Part-1)-2016 Response Spectrum load case should be the value of (Z/2 * I/R). Z is the value of direction factor, I is the value of importance factor and R is the value of Response Reduction factor.

It must be provided in X, Y and Z direction if used in load case. The default value of this factor is Zero.