Back9.17.3.4.(1)

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OS2.1, OS2.4, OS2.3

 

APPLICATION:

Adjustable steel columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are used to support an imposed load not exceeding 36 kN from:
  • beams carrying loads from not more than 2 wood-frame floors where:
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible exterior platforms, or 1 level plus roof, where:
    • the supported length of joists bearing on such beams or rim joists does not exceed 5 m,
    • the sum of the specified snow and occupancy loads on the platform-type construction or roof does not exceed 4.8 kPa,
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.

INTENT:

To limit the probability that the performance of adjustable steel columns will fall significantly below expectations.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, or
  • for environmental separators or elements supporting an environmental separator, excessive deformation or deflection of exterior walls or roofs, which could lead to the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OP2.1, OP2.4, OP2.3

 

APPLICATION:

Adjustable steel columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are used to support an imposed load not exceeding 36 kN from:
  • beams carrying loads from not more than 2 wood-frame floors where:
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible exterior platforms, or 1 level plus roof, where:
    • the supported length of joists bearing on such beams or rim joists does not exceed 5 m,
    • the sum of the specified snow and occupancy loads on the platform-type construction or roof does not exceed 4.8 kPa,
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.

INTENT:

To limit the probability that the performance of adjustable steel columns will fall significantly below expectations.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure,
  • for environmental separators or elements supporting an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements, or
  • an inability to resist expected loads, which could lead to
    • the excessive deformation or deflection of walls, or
    • the excessive deflection or vibration of floors.
This is to limit the probability of:
  • the space being unsuitable for its intended use, or
  • damage to the building.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OH1.1, OH1.2, OH1.3

 

APPLICATION:

Adjustable steel columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are used to support an imposed load not exceeding 36 kN from:
  • beams carrying loads from not more than 2 wood-frame floors where:
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible exterior platforms, or 1 level plus roof, where:
    • the supported length of joists bearing on such beams or rim joists does not exceed 5 m,
    • the sum of the specified snow and occupancy loads on the platform-type construction or roof does not exceed 4.8 kPa,
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.

INTENT:

To limit the probability that the performance of adjustable steel columns will fall significantly below expectations.
For columns that support exterior walls or roofs, this is to limit the probability of excessive deformation or deflection, which could lead to compromised environmental separators, which could lead to:
  • condensation,
  • precipitation ingress, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures of interior spaces, relative humidity, or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • further compromised integrity of environmental separators, which could lead to the deterioration of building elements.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OH4

 

APPLICATION:

Adjustable steel columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are used to support an imposed load not exceeding 36 kN from:
  • beams carrying loads from not more than 2 wood-frame floors where:
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible exterior platforms, or 1 level plus roof, where:
    • the supported length of joists bearing on such beams or rim joists does not exceed 5 m
    • the sum of the specified snow and occupancy loads on the platform-type construction or roof does not exceed 4.8 kPa
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.

INTENT:

To limit the probability that the performance of adjustable steel columns will fall significantly below expectations.
This is to limit the probability of:
  • compromised structural integrity, or
  • for environmental separators or elements supporting an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
For floors and elements supporting floors, this is to limit the probability of excessive deflection or vibration of floors, which could lead to negative effects on the psychological well-being of persons.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

F20

To support and withstand expected loads and forces.

F22

To limit movement under expected loads and forces.

Objective:

OS3.1, OS3.7

 

APPLICATION:

Adjustable steel columns, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], that are used to support an imposed load not exceeding 36 kN from:
  • beams carrying loads from not more than 2 wood-frame floors where:
    • the supported length of joists bearing on such beams does not exceed 5 m, and
    • the live load on any floor does not exceed 2.4 kPa,
  • beams or header joists carrying loads from not more than 2 levels of wood-frame balconies, decks or other accessible exterior platforms, or 1 level plus roof, where:
    • the supported length of joists bearing on such beams or rim joists does not exceed 5 m,
    • the sum of the specified snow and occupancy loads on the platform-type construction or roof does not exceed 4.8 kPa,
    • the platform serves only a single suite of residential occupancy, and
    • the platform does not serve as a required exit, and
  • carport roofs.

INTENT:

To limit the probability that the performance of adjustable steel columns will fall significantly below expectations.
This is to limit the probability of:
  • compromised structural integrity,
  • for environmental separators or elements supporting an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements, or
  • an inability to resist expected loads, which could lead to
    • the excessive deformation or deflection of walls, or
    • the excessive deflection or vibration of floors.
This is to limit the probability of:
  • the compromised operation of doors or windows required for egress in an emergency, or
  • for floors and elements supporting floors, persons losing their balance, tripping or falling.
This is to limit the probability of harm to persons.