When is additional reinforcement required for loads on concrete tanks?

Additional reinforcement for loads on concrete tanks is crucial when the tanks are subject to vehicular traffic or if they are located deeper than 3 feet. The rationale behind this is that both conditions increase the likelihood of stresses and loads being applied to the tank, necessitating additional strength to prevent cracking or failure.

When a concrete tank is at a depth greater than 3 feet, the weight of the soil above can exert significant pressure on the tank, which may require reinforced designs to cope with that additional load. Similarly, if the tank is located in an area where vehicles will be driving over it, the dynamic loads created by the movement and weight of the vehicles can lead to structural issues if the tank does not have sufficient reinforcement.

In contrast, exposure to sunlight or being less than 3 feet below finished grade does not inherently necessitate additional reinforcement. Sunlight may affect the external surfaces over time but does not contribute to the immediate structural integrity under load conditions. Additionally, a concrete tank less than 3 feet from the grade does not automatically mean it will require extra strength since the loads and environmental conditions are less severe.

The correct understanding of these requirements helps ensure the structural integrity and longevity of concrete tanks in various conditions.