Diameter of steel reinforcing bars should not excced ………….mm for a 100 mm thick RCC slab.

 

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 11) Diameter of steel reinforcing bars should not excced ………….mm for a 100 mm thick RCC slab.

ans - 1/8th of the thickness of the slab 

concept

For a 100 mm thick RCC slab, the diameter of steel reinforcing bars should not exceed 12.5 mm (100/8). 

Here's a more detailed explanation:

IS 456:2000 Clause:

According to IS 456:2000, the diameter of reinforcing bars in a slab should not exceed one-eighth of the total thickness of the slab. 

Calculation:

In this case, the slab thickness is 100 mm. Therefore, the maximum diameter of the reinforcing bars should be 100 mm / 8 = 12.5 mm. 

Practical Considerations:

While the theoretical limit is 12.5 mm, in practice, standard bar sizes are used. Common sizes for main reinforcement in slabs include 8 mm, 10 mm, and 12 mm. 

Minimum Reinforcement:

It's important to remember that there are also minimum reinforcement requirements in slabs, which vary based on the type of steel used (mild steel or high-strength deformed bars).