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

The following irregularities are evaluated in STAAD.Pro CE for IS 1893(Part-1)-2016 code

Plan Irregularities (Table 5)

• Torsion Irregularity (Table 5-i)
• Geometry Irregularity (Re-Entrant corner) (Table 5-ii)

Vertical Irregularity (Table 6)

• Soft storey (Table 6-i)
• Mass Irregularity (Table 6-ii)
• Irregular modes of oscillation (Table 6-vii)