To support and withstand expected loads and forces.

Distribution of wind loads acting over surface areas
of *buildings* and along each of the two principal horizontal axes of *buildings*.

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.

To limit the probability that:

- the distribution of wind load over surface areas of a building will not take into account the expected distribution of maximum wind pressures on the surface areas, including probable uniform as well as non-uniform distribution due to wind turbulence and wind direction, and
- the distribution of wind load along the two principal horizontal axes of a building will not take into account the effects of expected maximum winds from all directions.

This is to limit the probability that the
high forces in critical structural elements (e.g. structural columns sensitive
to building torsion, web diagonals of roof trusses) will be undervalued in
the calculations, which could lead to structural failure, which could lead
to harm to persons.

To support and withstand expected loads and forces.

To limit movement under expected loads and forces.

Distribution of wind loads acting over surface areas
of *buildings* and along each of the two principal horizontal axes of *buildings*.

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.

To limit the probability that:

- the distribution of wind load over surface areas of a building will not take into account the expected distribution of maximum wind pressures on the surface areas, including probable uniform as well as non-uniform distribution due to wind turbulence and wind direction, and
- the distribution of wind load along the two principal horizontal axes of a building will not take into account the effects of expected maximum winds from all directions.

This is to limit the probability that the
high forces in critical structural elements (e.g. structural columns sensitive
to building torsion, web diagonals of roof trusses) will be undervalued in
the calculations, which could lead to:

- the excessive deformation of the building structure, or excessive stress in structural elements, which could lead to damage to the building, or
- the excessive deflection of the building structure, which could impede the intended use and occupancy of the building.

To limit movement under expected loads and forces.

Distribution of wind loads acting over surface areas
of *buildings* and along each of the two principal horizontal axes of *buildings*.

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.

To limit the probability that:

- the distribution of wind load over surface areas of a building will not take into account the expected distribution of maximum wind pressures on the surface areas, including probable uniform as well as non-uniform distribution due to wind turbulence and wind direction, and
- the distribution of wind load along the two principal horizontal axes of a building will not take into account the effects of expected maximum winds from all directions.

This is to limit the probability that the
high forces in critical structural elements (e.g. structural columns sensitive
to building torsion, web diagonals of roof trusses) will be undervalued in
the calculations, which could lead to the excessive vibration or excessive
deflection of the building structure, which could lead to negative effects
on the psychological well-being of persons.