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Designing the right size beam is crucial to keep the building or structure stable, with standing upcoming loads.
But determining the right size beam requires following the right method and collecting lots of information.
For example, if you want to know what size beam for 22 foot span, you must consider the type of material you will use, the type of beam it will be, and the number of various loads it will carry and transfer to the substructure.
Luckily, we have gone through all the hard work and prepared this post to mention the right size beam for a 22-foot span based on the type of the beam.
The basic principle of beam design
A beam is a load-bearing structure that transfers all the live and dead load, and the structural load comes from the RCC slab to the column through the development length.
The size of a beam is usually determined by the length between two supports and the load that comes on it. This structural member is also related to shear forces and flexural stresses.
The dimension of a beam is controlled by various types of shear stress and shear forces.
The beam also loads the bending moment developed on it, and its moment carrying ability depends on its depth.
The beam is usually constructed with reinforced concrete along with reinforcement steel. The other materials used to make a beam are:
- Laminated veneer lumber
How to measure the size of a beam?
For the RCC beam, the right depth of the beam is measured based on the experience, the amount of maximum bending moment, and the basis of the wall width under the beam.
The width and depth of the beam
The width of the bream should be good enough to offer rebars with enough side cover and spacing between the long bars.
After calculating the effective depth of the beam depending on the bending moment, it needs to determine the overall depth.
By adding effective cover with the calculated effective depth, you’ll get the overall width of the beam.
There are different types of beams, including:
- Continuous beam,
- Cantilever beam
- Overhanging beam
- Simply supported beam,
- Lintel beam
- Primary beam
- Fixed beam
- Secondary beam
For the dimension of a beam, you can go with the standard size of the RCC beam, which is 230mm x 230mm (9″ x 9″).
However, the depth of the beam varies depending on the span size and the load applied to it.
The process to determine the beam size for a 22 foot span
You can determine the beam size by following two methods, and they are:
- IS 456:2000
- Thumb rule method
To design the minimum RCC beam size for two or three storey buildings, the recommendations are:
- If it is a cantilever beam, the span length to effective depth ratio is 7
- If it is a simple supported beam, the span length to effective depth ratio is 20
- If it is a continuous beam, the span length to effective depth ratio is 26
Thumb rule method
The rules to determine the depth and size of beams are:
For 1 foot of beam span, the depth of the beam will be 1 inch. So, if the span length of your beam is 22 feet, the depth of the deem will be 22 inches and the width of the beam will be 11 or 12 inches.
What size beam for a 22 foot span
RCC beam size for 22 feet span
The beam size for 2 to 3-story buildings will be 10′′ 20′′ according to the thumb rule. the width of the beam is 10 inches and the depth of the beam is 20 inches.
It should provide 4 nos of 12mm bar at the top and 4 nos of 16mm bar at bottom of the beam.
The clean cover of the beam will be 25mm and the concrete mixing ratio is (1:1.5:3) following M20 grade.
Steel beam size for 22 feet span
Following a general thumb rule, the size of a steel beam for 22 feet span will be 350×140 or 14’’X5.5’’.
This size is applicable to any type of steel beam, whether it is an I beam, w beam, universal beam, rolled steel joist or a hot rolled section.
Under normal load conditions, it is a standard, ideal, and suitable size steel beam for 22 feet.
Wood beam size for a 22 foot span
The wood beam for 22 foot span will be 2×14 and you should place it 16 inches apart from the middle whether it is for projects, residential buildings, or construction.
LVL beam size for a 22 foot span
The size of the LVL beam or GLULAM will be 10’’ or 12’’ deep and 3’’ wide for 22 foot span following the thumb rule.
For a 22-foot span, you will need 10-12′′ GLULAM, and you can use 214 lumber, placing 16″ apart from the center if you use it as floor joists for residential buildings or other projects.
Determining what size beam for 22 foot span require a huge number of consideration and calculations.
It means you should consider the type of beam, the amount of shear force, bending moment, and different types of load.
But you can cut down all the research and calculation time simply by going with the recommendation that we determined through the thumb rule.
So consider the material of the beam you will use and construct the right size based on its recommended size.