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A simply supported beam shall be deemed to be a deep beam when the ratio of effective span to overall depth, is less than:

A simply supported beam shall be deemed to be a deep beam when the ratio of effective span to overall depth, is less than: Correct Answer <span style="">2.0</span>

Explanation:

According to IS 456-2000, a beam shall be deemed to be a deep beam when the ratio of effective span-to-overall depth, l/D is less than:

  1. 2.0, for simply supported beam
  2. 2.5, for a continuous beam.

Though different codes define deep beams in different clear span-to-depth ratios, as a general rule deep beams are recognized by their relatively small span-to-depth ratio.

Hence, Deep beams are designed for bending moments and checked for shear.IS 456:2000 page 51.

 Additional Information

Deep beams:

  • Deep beams are structural elements loaded as simple beams in which a significant amount of the load is carried to the supports by a compression force combining the load and the reaction. As a result, the strain distribution is no longer considered linear, and the shear deformations become significant when compared to pure flexure.
  • In view of ample shear strength, deep beams are primarily recommended as transfer girders. These members transfer loads through-loading face to supports in the transverse direction.
  • The deep horizontal members predominantly fail in shear rather than flexure. These beams are characterized with small span-to-depth ratio. Pile caps, corbel, brackets, foundation walls and off-shore structures are few examples of RC deep beams.

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