TABLE 1
VERTICAL LOAD EFFECT PENALTIES FOR IRREGULARITIES FOR
IRREGULARITY CATEGORIES D, E & F (Expressed as percentage increase of
regular load effects)
        D E & F
1. Stiffness Irregularity 0% Static load Effect increase but 0% Load Effect increase but
(a) Soft Storey account for Dynamic Response on  account for Dynamic Response 
        Load Effect on Load Effect
(b) Extreme Soft Storey 0% Static load Effect increase but Not Permitted
account for Dynamic Response on 
        Load Effect      
2. Mass Irregularity 0% Load Effect increase but 0% Static Load Effect increase but 
        account for Dynamic Response account for Dynamic Response
3. Geometric Irregularity 0% Static Load Effect increase but 0% Static Load Effect increase but
Dynamic Response on account account Dynamic Response on
        for Load Effect   Load Effect  
4. In plane Discontinuity 25% Connection of collector to 25% Connection of collector to
Lateral Force Resisting vertical elements vertical elements
Elements   Axial load Transfer in cols
              100 to 200% increase
5. Discontinuity in Lateral (For up to Category C  
Strength or Weak Story 0.75 Cd resulting in a possible  
increase 50 to 550%)
2 storey Category D Not Permitted Not Permitted
> 2 storey Not Permitted Not Permitted