In determining wind pressure, which horizontal dimension of the building is perpendicular to the wind direction?

To determine wind pressure acting on a building, it's essential to understand how the orientation of the building's dimensions relates to the wind direction. In this context, the horizontal dimension that is perpendicular to the wind flow is critical for calculating the wind load correctly.

When wind hits a building, the pressure exerted on its surfaces varies with the orientation. The dimension that is oriented perpendicular to the wind direction is crucial because it determines the effective area over which the wind pressure acts. This pressure is typically greater on surfaces that face directly into the wind, influencing design considerations for structural integrity and stability.

If 'A' represents a dimension that is perpendicular to the wind flow—let's say the breadth of the building—then it is indeed the dimension that should be used when calculating the wind pressure as per engineering standards, which often reference parameters such as the building's width or breadth in such calculations.

The other options mentioned—length (L), width, and height—may relate to various aspects of structural calculations but do not correspond to the dimension acting perpendicular to the wind in this case. This understanding is crucial for engineers when assessing wind loads to ensure safety and compliance with building codes.