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4.1.8.15.(6)
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Application
Application 1: 
Design forces for the Seismic Force Resisting System when the Rd and Ro values conform to Table 4.1.8.9. and the foundation is designed in accordance with Sentence 4.1.8.16.(1).
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 supersede the requirements of Article 4.1.8.11., which applies to the Equivalent Static Force Procedure, and of Article 4.1.8.12., which applies to the Dynamic Analysis Procedure, and limit the design forces for the elements of the Seismic Force Resisting System to the maximum values corresponding to the force for which the rocking foundation is designed.
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