9.20.11.6.(1)

Intent 1:

To limit the probability of insufficient depth of concrete or masonry for an adequate bond with anchor bolts, which could lead to inadequate withdrawal resistance, which could lead to an inability to resist expected wind loads, which could lead to overturning, lifting, sliding or excessive deflection of the superstructure.

This is to limit the probability of:

• compromised structural integrity of the superstructure, or
• where piers support an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration.

For floors and elements supporting floors, this is to limit the probability of excessive movement, deflection or vibration, which could lead to negative effects on the psychological well-being of persons.

Intent 2:

To direct Code users to Sentence 9.15.2.3.(4), which contains requirements for piers.