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4.1.8.15.(4)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
Application
Application 1: 
Effects of concurrent yielding of elements framing into columns or walls where earthquake actions can produce forces in columns or walls due to lateral loading along both orthogonal axes.
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, where elements of the Seismic Force Resisting System are subject to forces from two loading directions, the potential for simultaneous yielding will not be taken into account, which could lead to structural failure, which could which could lead to harm to persons.
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