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As per IS 456-2000 for the design of reinforced concrete beam, the maximum allowable shear stress (τ_max) depends on the

1. grade of concrete and grade of steel
2. grade of concrete only
3. grade of steel only
4. grade of concrete and percentage of reinforcement

Correct answer: grade of concrete only

Solution

The maximum allowable shear stress in reinforced concrete beams is primarily influenced by the grade of concrete, as it determines the material's strength and ability to resist shear forces. The grade of steel does not directly affect the shear capacity in this context.

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