The Least Horizontal Dimension can be taken as the shortest possible distance that can be taken between two parallel lines that fully encompass the building

The Least Horizontal Dimension is further demonstrated as follows:

Where B is the Least Horizontal Dimension.



Jul 27, 2016   6276  
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  1. An engineer should really decide on a case by case basis, but generally speaking the least horizontal dimension would vary based on the use case. For a first floor components and cladding analysis the wind vorteces would generally follow a slimmer profile than a wider upper floor. In this case though I would take the more critical values as wind has a tendency to even out across multiple short planes like this, plus it’s the more conservative approach.

  2. What is the ground floor has a smaller footprint(s) than the rest of the buliding? Do you draw parallel lines and measure ‘a’ from the entire building perimeter? or just at the level where your item is located (e.g. a hollow metal opening)?

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