Deep Beams Design [Civil engineering MCQs]

Deep beams are designed for

[A] Shear Force only
[B] Bending Moment only
[C] Both Shear Force and Bending Moment
[D] Bearing

Correct answer for deep beams are designed for is Bending Moment only

Detailed Explanation for Deep Beams Are Designed

Deep beams are structural members loaded as simple types of 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.

Also Read: Load Transfer by a Beam is Primarily by MCQs

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 a small span-to-depth ratio.

Examples of RC deep beams

Pile caps, corbel, brackets, foundation walls, and off-shore structures are few examples of RC deep beams.

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; and
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 moment and checked for shear.

IS 456:2000 page 51. Download IS 456 2000 PDF