What Is A Cantilever Beam?
A Cantilever Beam is a rigid structural member in which one end is fixed and another end is free and it can be made up of steel, concrete, and composite material.
The cantilever beam transfers the load to the support and it can manage the sheer force and moment of force. Shear force means stress applied parallel to the material and moment force is characterized as a force to rotate or twist an object. Also, this beam can be constructed with a slab or truss.
Application of Cantilever Beam
The cantilever Beam is applicable in the following cases,
- Construction of Building.
- Constructing a cantilever Bridge.
- For overhanging Roof projects such as stadium Roofs, Shelters.
- For making furniture, shelving.
In building construction, there are the different applications of the cantilever beam such as a roof, runway, gallery, traveling crane, above part of the building there also used as shelves, large halls, armories, sun shed, exhibition building. Large spans mostly used cantilever construction.
Read More: Types of Load | Types of Load Acting on Structure | Types of Load on Beam
Advantages of Cantilever Beam
- A Cantilever Beam is quite easy to construct.
- Only one side support is required and support on the opposite side is not required because it is a free end.
- It creates a negative bending moment that assists to counteract a positive bending moment.
- The span of a Beam can be more than that of a simple beam because a beam can be added to the cantilever arms.
- It is stiffer as compared to other types of the beam due to its depth.
- The span of beams can be longer than simple beams because beams can be added to the cantilever supports.
- This beam is easy for maintaining ground motion and thermal expansion.
Disadvantages of Cantilever Beam
- In Cantilever beam large deflection occurs.
- In a this beam, when a beam is loaded at one end, then a high moment generates at the fixed end and if more load is applied, then it can be broken free from support.
- The depth of the cantilever beam is high so that required more material.
- For reducing weight in infrastructures used truss construction.
Read More: What Is Grade Beam | Grade Beam Foundation | Grade Beam Construction
Cantilever Beam – Single load at the end
Cantilever Beam Single load at an End
Maximum Reaction Force
Maximum Reaction Force at the fixed end can be evaluated as,
RA = F
Where,
- RA = reaction force
- F = single-acting force
Maximum Moment
Maximum Moment can be produced at the fixed end and it can be derived as a,
M max = MA
= – FL
Where,
- MA = maximum moment in A
- L = length of the beam (m, mm, in)
Cantilever Beam at intermediate load
Maximum Reaction Force
Maximum Reaction force at the fixed end can be expressed as
RA = F
Where,
- RA = reaction force in A
- F = single-acting force in B
Maximum Moment
The maximum moment at the fixed end can be expressed as,
Mmax = MA
= -Fa
Where,
- MA = maximum moment in A
- a = length between A and B
Cantilever Beam – Uniform Distributed Load
Maximum Reaction
Maximum Reaction at the fixed end can be expressed as,
RA = q L
Where,
- RA = reaction force in A
- q = uniform distributed load
- L = length of a cantilever beam
Maximum Moment
Maximum Moment at the fixed end can be expressed as
MA = – q L2 / 2
Read More: Load on Column, Beam & Slab | Column Design Calculations pdf
FAQs:
What are the Application of Cantilever Beam?
Construction of Building.
Constructing a cantilever Bridge.
For overhanging Roof projects such as a stadium Roofs, Shelters.
For making furniture, shelving.
What are the Disadvantages of a Cantilever Beam?
In This beam, large deflection occurs.
In this, when a beam is loaded at one end, then a high moment generates at the fixed end and if more load is applied, then it can be broken free from support.
The depth of this beam is high so that required more material.
For reducing weight in infrastructures used truss construction.
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