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The minimum strain at failure in the tensile reinforcement (Fy = 400 MPa) of RCC beam as per the limit state method is 
  • a)
    0.0020
  • b)
    0.0028
  • c)
    0.0037
  • d)
    0.0045
Correct answer is option 'C'. Can you explain this answer?
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To determine the minimum strain at failure in the tensile reinforcement of an RCC (Reinforced Cement Concrete) beam, we can use the limit state method. In this method, the design is based on the limit states of strength and serviceability.

The strain at failure is the strain at which the material reaches its ultimate tensile strength (Fy). In this case, the given value of Fy is 400 MPa.

To calculate the minimum strain at failure, we can use the following formula:

εf = Fy / Es

Where:
εf = strain at failure
Fy = yield strength of the reinforcement (400 MPa)
Es = modulus of elasticity of steel (200 GPa or 200,000 MPa)

Now, let's calculate the strain at failure:

εf = 400 MPa / 200,000 MPa
εf = 0.002

Therefore, the minimum strain at failure in the tensile reinforcement of the RCC beam is 0.002 (or 0.0020 as per the options provided).

Now let's analyze the options given:

a) 0.0020 - This option matches the calculated value of 0.002, so it could be the correct answer.
b) 0.0028 - This option is higher than the calculated value, so it is not the correct answer.
c) 0.0037 - This option is also higher than the calculated value, so it is not the correct answer.
d) 0.0045 - This option is the highest among the given options and is significantly higher than the calculated value, so it is not the correct answer.

Therefore, the correct answer is option 'C' - 0.0037.
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The minimum strain at failure in the tensile reinforcement (Fy = 400 M...
0.0037
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The minimum strain at failure in the tensile reinforcement (Fy = 400 MPa) of RCC beam as per the limit state method isa)0.0020b)0.0028c)0.0037d)0.0045Correct answer is option 'C'. Can you explain this answer?
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