9.20.9.4.(3)

Objective

OS3 Safety in Use

Attribution

[F20,F80-OS3.1]Applies to floors and elements that support floors.
[F20,F80-OS3.7]Applies to walls, and elements that support walls, that contain doors or windows required for emergency egress.

Intent

Intent 1:

To limit the probability of:

  • inadequate corrosion resistance, which could lead to the corrosion of metal ties,
  • an inadequate cross-sectional area, or
  • an inadequate shear area through the mortar.

This is to limit the probability of:

  • buckling failure of metal ties under lateral loads,
  • tensile failure of metal ties under gravity loads, and
  • failure of the bond between mortar and metal ties under lateral loads.

This is to limit the probability of inadequate load distribution among the wythes of multiple-wythe masonry walls, which could lead to an inability to resist transverse or vertical loads, which could lead to cracking or buckling.

This is to limit the probability of:

  • compromised structural integrity of masonry construction,
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration,
  • in assemblies exposed to moisture or the exterior, damage and deterioration, or
  • an inability to resist expected loads, which could lead to:
    • the excessive movement or deformation of walls, or
    • the excessive deflection or vibration of floors.

This is to limit the probability of:

  • compromised operation of doors or windows required for egress in an emergency, or
  • persons losing their balance, tripping or falling.

This is to limit the probability of harm to persons.

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