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4.1.8.3.(7)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
Application
Application 1: 
Accounting for stiffness imparted to the structure from elements not part of the Seismic Force Resisting System.
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 ), and
  • Sentence 4.1.8.3.(6), which applies to stiff elements that are
    • adequately separated from all structural elements so that they do not significantly affect the behaviour of the building during an earthquake, or
    • made part of the Seismic Force Resisting System.
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 effects of stiffness of elements not part of the Seismic Force Resisting System on the structure will not be taken into account in the design of the structural elements, which could lead to structural failure, which could lead to harm to persons.
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