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4.1.8.16.(1)
ApplicationIntent
OS2+OP2
Application
Application 1: 
Design of foundations of buildings for earthquake, where foundations are allowed to rock.
Exceptions: 
except as stated in Sentence 4.1.8.1.(1), which applies to areas where the spectral response acceleration amplified for site conditions equals the floor levels found in low seismicity regions with Site Class C (i.e. very dense soil and soft rock).
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.
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Intent
Intent 1: 
To modify the application of Sentence 4.1.8.16.(1) and allow the foundation design to be consistent with a ductility-based force reduction factor of 2 where the foundation is allowed to rock, which has been shown to produce lateral displacements comparable with a fixed base elastic case.
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