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4.1.8.17.(1)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20,F22-OS2.4]
Application
Application 1: 
Design of the following elements of buildings and their anchorage to accommodate the building deflections, as defined in Article 4.1.8.13., and the element or component deflections, as defined in Sentence 4.1.8.17.(10), and for a lateral force, Vp, using the formula provided:
  • all exterior and interior walls, and their connectors,
  • exterior and interior ornamentations and appendages,
  • floors and roofs acting as diaphragms,
  • towers, chimneys, smokestacks and penthouses that are connected to, or form part of, a building,
  • 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.
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.
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 expected seismic distortion of the building structure will damage or displace architectural, mechanical or electrical components, which could lead to elements of the building falling or sliding, which could lead to harm to persons.
Intent 2: 
To limit the probability that the lateral seismic force used for the design of anchorage for architectural, mechanical or electrical components, will not take into account all the factors that affect the expected magnitude of the inertial seismic force, which could lead to elements of the building falling or sliding, which could lead to harm to persons.
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