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Assertion (A): A concrete jacket that stops at each floor adds little flexural strength.

Reason (R): Its longitudinal bars cannot develop force across the joint.

Select the correct option.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A at all
  • C.A is true but R is false, since the bars develop their force within the jacket itself
  • D.A is false but R is true, since such a jacket adds a great deal of flexural strength

Answer: A

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. Flexural strength comes from the longitudinal bars developing tension and compression across the critical section at the joint. A jacket stopping at the floor has nowhere to anchor those bars, so it adds confinement and shear capacity but very little flexural strength - which is why continuity through the slab is the difficult and essential detail.

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