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Reinforced Cement Concrete

Assumptions in Limit State of Flexure -I

As per IS: 45...

Question

As per IS: 456 - 1978, the ratio of stress in concrete to its characteristic strength at collapse in flexure for design purposes is taken as

A

0.67

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B

0.576

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C

0.447

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D

0.138

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Solution

The correct option is C 0.447
The compressive strength of concrete in the structure shall be assumed to be 0.67 times the characteristic strength. The partial safety factor of 1.5 shall be applied in addition to this.
Thus stress in concrete at collapse
$= \frac{0.67}{1.5} f_{c k} = 0.447 f_{c k}$

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