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.