Which type of load is NOT considered a structural load type in engineering design?

Cyclic loads are not typically categorized as a primary structural load type in engineering design. Structural loads are primarily classified to help engineers understand the forces and effects acting on a structure. Dead loads, live loads, and environmental loads are fundamental concepts in this classification system.

Dead loads refer to the static forces that are permanent in nature, such as the weight of the structural elements themselves and any fixed equipment. Live loads encompass dynamic, temporary forces that act on a structure, like the weight of occupants, furniture, or movable equipment. Environmental loads include factors like wind, snow, and seismic activity that can impose varying forces on a structure depending on external conditions.

Cyclic loads, on the other hand, refer to forces that can vary over time, often due to repetitive or fluctuating movements, such as vehicles passing over a bridge. While cyclic loads are indeed important to consider, especially for fatigue analysis in materials, they do not fall under the standard classification of structural load types typically addressed during the initial design phase. Instead, they may be a secondary consideration when analyzing the long-term performance of the structure under specific conditions.