What term describes the sideways deflection of axial vertical loads?

The term that refers to the sideways deflection of axial vertical loads is more accurately identified as "Chord Drift." This term is commonly used in structural engineering and is particularly relevant in the analysis of beams and frames subjected to vertical loads. When a vertical load is applied to a structural element, it can cause not only vertical displacement but also lateral deflection, which is described by the term chord drift. This is crucial for understanding the overall behavior of the structure under load and ensuring that it meets safety and serviceability requirements.

In this context, understanding chord drift helps engineers design structural elements that can adequately withstand not just the vertical loads but also the associated lateral movements that might arise during loading conditions.