A Cantilever Beam is one which

By BYJU'S Exam Prep

Updated on: September 11th, 2023

A cantilever beam is one which is fixed at one end and free at the other end. The cantilever beam can be built of steel or concrete, with one end cast or fastened to a vertical support. It is a horizontal beam structure, and the free end is exposed to vertical loads. A cantilever is built as an extension of a continuous beam in a building and a section of a cantilever girder in a bridge. It can be built using pre-stressing techniques or cast-in-place segmental construction.

Structure of Cantilever Beam

Unsupported at one end and free at the other, a Cantilever Beam is a rigid structural component. Steel or concrete can be used to create the cantilever beam, which has one end that is cast or fastened to a vertical support. Its free end, exposed to vertical loads, is a horizontal beam structure. A beam with one end fixed and the other free is known as a Cantilever beam.

The fixed support stops the beam’s displacement and rotation at that end. The cantilever transfers the load from the beam’s free end to the support, where it exerts the sheer force [V] and the bending moment [B.M.] at the fixed end.

Advantages of Cantilever Beam:

The following are some of the Cantilever Beam’s main advantages:

  • Cantilever beams don’t need assistance from the other side.
  • Cantilever beams’ negative bending moments balance the positive bending moments produced.
  • Cantilever beams are simple to build.

Disadvantages of Cantilever Beam:

The following are the Cantilever Beam’s Disadvantages:

  • Large deflections are applied to cantilever beams.
  • Moments are greater for Cantilever Beams.
  • The construction must have sturdy fixed support or a back span to remain stable.

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