The minimum nominal thickness for bridge decks recommended by the American Concrete Institute (ACI) is 10 inches. This thickness is established to provide adequate structural integrity and durability, ensuring that the bridge can safely support the loads it is designed to bear over its lifespan. Using this thickness helps mitigate issues such as cracking, deflection, and long-term deterioration caused by environmental factors and traffic loads.
The recommendation is based on extensive research and practical considerations in bridge design, accounting for factors like load distribution, the potential for freeze-thaw cycles, and the overall lifespan of the structure. Selecting a nominal thickness of 10 inches strikes a balance between material use and ensuring that the bridge performs effectively under operational conditions.
In contrast, other thicknesses, such as 8, 12, or 14 inches, may not align with ACI guidelines. While thicker decks could provide more capacity, they also increase material costs and weight without corresponding benefits, making the 10-inch guideline a practical choice for most bridge designs.