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Reinforced Cement Concrete

Design Shear Strength of Concrete

Consider the ...

Question

Consider the following statements:
1. Reinforcement that is no longer required for flexure beyond a certain section, shall however be extended by d or 12 $ϕ$ . whichever is greater, before being curtailed.
2. Atleast half the bars should be bent up at the cut-off point.
3. The shear capacity at cut-off point should atleast be 1.5 times the shear force at that section.

Which of these statements are correct?

A

1 and 2

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B

1 and 3

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C

2 and 3

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D

1, 2 and 3

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Solution

The correct option is B 1 and 3
As per IS : 456-2000,
(i) clause 26.2.3.1, for curtailment, reinforcement shall extend beyond the point at which it is no longer required to resist flexure for a distance equal to the effective depth of the member or 12 times the bar diameter whichever is greater except at simple supports or ends of cantilever.

(ii) clause 26.2.3.2, the shear at cut off point does not exceed two-thirds that permitted including the shear strength of web reinforcement provided.

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Q. Consider the following statements:
1. Reinforcement that is no longer required for flexure beyond a certain section, shall however be extended by d or 12

ϕ

. whichever is greater, before being curtailed.
2. Atleast half the bars should be bent up at the cut-off point.
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Which of these statements are correct?

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