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4.1.8.9.(3)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
Application
Application 1: 
Product of RdRo to be used for combinations of different types of Seismic Force Resisting Systems, applicable to the building structure, to be used in calculating the base lateral earthquake force, V, in Sentence 4.1.8.11.(2), and the base lateral earthquake force (dynamic analysis), Vd, in Sentence 4.1.8.12.(5).
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 limit the probability that the earthquake design will not reflect that the response of the Seismic Force Resisting System should be governed by its most vulnerable part, which could lead to structural failure, which could lead to harm to persons.
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