Explanation:

Unequal top and bottom reinforcement in a reinforced concrete section leads to creep deflection. This can be explained with the following points:

Creep Deflection:

Creep is the time-dependent deformation of concrete under sustained load. When a concrete member is subjected to a sustained load, the concrete will gradually creep or deform over time. This deformation is called creep. The magnitude of creep deformation depends on the magnitude of the sustained load, the age of the concrete, the relative humidity, and the temperature. Creep deformation is time-dependent and occurs slowly over a long period of time.

Effect of Unequal Top and Bottom Reinforcement:

When the top and bottom reinforcement in a reinforced concrete section is not equal, it results in an unbalanced section. This unbalanced section will experience a differential deformation due to creep. The top part of the section will experience a larger creep deformation compared to the bottom part of the section. This is because the top part of the section is subjected to a larger sustained load compared to the bottom part of the section. As a result, the top part of the section will deflect more than the bottom part of the section, resulting in an uneven or sloping surface.

Conclusion:

In conclusion, unequal top and bottom reinforcement in a reinforced concrete section leads to creep deflection. This can result in an uneven or sloping surface, which can have a negative impact on the performance and aesthetics of the structure. It is important to ensure that the top and bottom reinforcement in a reinforced concrete section is equal to avoid creep deflection.

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