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4.1.8.17.(10)
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Determination of lateral deflections of elements or components due to earthquake.
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.
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 4.1.8.17.(2), which applies to the following elements of non post-disaster buildings in areas where IEFaSa(0.2) is less than 0.35:
    • horizontally cantilevered floors, balconies, beams, etc.
    • suspended ceilings, light fixtures and other attachments to ceilings with independent vertical support
    • masonry veneer connections
    • access floors
    • masonry or concrete fences over 1.8 m tall
    • machinery, fixtures, equipment, ducts, and tanks (including contents)
    • flat bottom tanks (including contents) attached directly to a floor at or below grade within a building
    • pipes, ducts, cable trays (including contents)
    • electrical cable trays, bus ducts, conduit
    • rigid components, and
    • flexible components.
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Intent
Intent 1: 
To limit the probability that the calculation of the deflection of elements or components will not take into account the expected lateral deflection and twist of the building structure, including inelastic deformation, due to the maximum expected seismic ground motions, which could lead to damage to or displacement of attached or adjacent components of the building, which could consequently fall or slide, which could lead to harm to persons.
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