Why must compression reinforcement in a doubly reinforced beam be enclosed by stirrups?

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  1. To reduce the amount of steel required in compression
  2. To increase the slenderness ratio of the beam
  3. To prevent buckling and improve ductility by confining the concrete 
  4. To provide additional strength to the tension reinforcement

Answer (Detailed Solution Below)

Option 3 : To prevent buckling and improve ductility by confining the concrete 
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Detailed Solution

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Explanation:

  • In a doubly reinforced beam, the compression reinforcement is subjected to compressive forces.

  • Stirrups (transverse reinforcement) hold the compression bars in place, prevent lateral buckling, and contribute to concrete confinement, enhancing ductility and structural integrity.

Additional Information Doubly reinforced beams

  • Doubly reinforced beams are used when the depth of the beam is restricted or when higher moment resistance is needed than what a singly reinforced beam can provide.

  • In such beams, compression reinforcement is added in addition to tension reinforcement.

  • To ensure the stability of the compression bars, especially under heavy loads, they must be enclosed by stirrups.

  • Stirrups serve multiple purposes: they resist shear, hold longitudinal bars in place, and prevent buckling of compression steel.

  • Confinement of concrete by stirrups also improves the ductility and energy absorption capacity of the beam, which is especially important in seismic zones.

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