To limit the probability that the calculation of specified wind pressure or suction on exterior surfaces of buildings will not take into account all the factors that affect the expected maximum magnitude and distribution of wind pressure or suction on exterior surfaces of buildings, which could lead to the excessive vibration or excessive deflection of the building, which could lead to negative effects on the psychological well-being of persons.
To limit the probability that the calculation of wind load used for the design of the building structure for vibration will not take into account the level of reliability appropriate for vibration serviceability, which could lead to the excessive vibration of the building, which could lead to negative effects on the psychological well-being of persons.