Cantilever beam can be defined as a beam which is supported on only one end. That means one end is fixed and the other end is exposed beyond the support.

Advantages of a cantilever beam:-

1. Very simple to construct.

2. Only one fixed support is required, support on the opposite side is not required.

3. These types of beams create a negative bending moment, which can help to counteract a positive bending moment created elsewhere. This is particularly helpful in cantilevers with a back span where a uniform load on the back span creates positive bending, but a uniform load on the cantilever creates negative bending.

4. The span can be greater than that of a simple beam because the beam can be added to the cantilever arms.

5. Because the beam is resting simply on the arms, thermal expansion and ground movement are fairly simple to sustain.

6. Cantilever beams are very rigid, due to their depth.

Disadvantages of a cantilever beam:-

1. Large deflections.

2. Generally results in larger moments.

3. You either need to have fixed support or have a back span and check for uplift of the far support.

4. When the beam is loaded at one end, the moment at the fixed end is higher, if more load is applied it can break free from the support.

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