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
- 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.