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4.1.8.15.(3)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.4]
Application
Application 1: 
Design of elements of the Seismic Force Resisting System in buildings with vertical variations of RdRo that satisfy the requirements of Sentence 4.1.8.9.(4).
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 lower system will be designed for lower forces than the upper system, which could lead to a weaker lower level, which could lead to yielding in the less ductile lower level, which could lead to structural failure, which could lead to harm to persons.
Intent 2: 
To direct Code users to Sentence 4.1.8.9.(4), which addresses the values of RdRo.
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