**Beam depth for 5m, 6m, 7m, 8m, 9m and 10m span & formula**, hi guys in this article we know about calculation of beam depth | beam depth for 5m span | beam depth for 6m span | beam depth for 7m span | beam depth for 8m span | beam depth for 9m span | beam depth for 10m span | beam depth formula | beam depth to span ratio | beam depth to width ratio | How to calculate depth and width of beam?

The **beam is a flexural structural** member of concrete that transfers verticaly all the dead load, the live load of the slab to the column. The horizontal load of slab directly transfer to beam. Beam experience bending moment and resist the load applied to it by slab. Maximum quantity of reinforcement provided in middle of tension zone and both end of beam – column joint of compression zone.

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**1)what is concrete and its types and properties**

**2) concrete quantity calculation for staircase and its formula**

We all know that **calculating beam size** is essential and indispensable while designing a building. In this post, you will get to know the method of how to calculate the beam depth before designing a beam for 2 to 3 storey building design plans or multi-storey building design plans.

**For designing the beam,** beam depth should be not only depending on span of beam but it is also depending on height of column for a structure and dead and live load of building acting on it with slenderness ratio.

It is essential to know how to calculate the beam depth size, load calculation and grade of concrete and grade of steel. You can design it with the help of beam design formula and concrete beam design calculator. Just brush the concepts once and start with the given process.

Apart from it, you can easily create a beam design from the concrete beam design formula, available on various sites. Still, as a structural engineer, you must know the beam design formula and their design procedure and have a proper understanding of basic physics principles and engineering statics, as they are significant for designing and sizing beams. A structural engineer has complete knowledge and is fully equipped to choose the material, size and shape accordingly and check the loads acting on a beam, calculate the forces and stresses on the structure.

**How to calculate depth and width of beam?**

**How to calculate the size of beam:-** beam is various type like cantilever beam, simply supported beam and continuous beam. Calculation of minimum size of RCC beam as per IS 456 2000, span to effective depth of beam ratio is 7 for cantilever beam, 20 for simply supported beam and 26 for continuous beam.

**Standard size of concrete beam** not be less than 9″×9″ (225mm × 225mm) provided with 4 nos of 12mm of Fe500 steel and m20 grade of concrete with stirrup [email protected]″C/C.

**1) Calculation of depth and width of simply supported beam:-**

**Note as per IS – 13920**

A) the width to depth ratio should be more than 0.3 ( width/depth > 0.3).

B) depth of beam shall not be exceeded One by fourth (1/4) of clear span.

Let clear span of beam = 5m = 5000mm

Effective depth = span/basic value

Total depth = effective depth + diameter of bar/2 + clear cover size.

Width of beam = Depth/1.5 ( width of beam should not be less than 200 mm).

Span of simply supported beam = 5000mm

Effective depth of beam d = 5000/20=250mm

Total depth of beam = effective depth + diameter of bar/2 + clear cover size.

Assume clear cover size = 25mm

Diameter of bar =16mm

Total depth D = 250mm +16/2mm +25mm

Total depth D= 283mm, It should be taken as 300mm.

Width of beam = D/1.5, 300/1.5 = 200mm, so width of beam should be not less than 200mm in case of Block wall and 225mm in case of Brick wall. So width of beam taken as 225mm least.

Now check it,

Width/depth =225/300 =0.75 > 0.3, it is safe

Now we can check depth of beam = 1/4×5000= 1250 > 300, yes it is safe.

**Depth and width of simply supported beam**

simply supported beam with 5m span, 9″ thick Brick wall, using thumb rule, beam depth shold be 300mm and width 225mm, beam size 9″×12″ (225mm ×300mm) using 4nos of 16mm bar of Fe500 steel with minimum M20 grade of concrete and stirrups [email protected]″C/C.

**2) Calculation of depth and width of Cantilever beam:-**

Note as per IS – 13920

A) the width to depth ratio should be more than 0.3 ( width/depth > 0.3).

B) depth of beam shall not be exceeded One by fourth (1/4) of clear span.

Let clear span of cantilever beam = 2m = 2000mm

Effective depth = span/basic value

Total depth = effective depth + diameter of bar/2 + clear cover size.

Width of beam = Depth/1.5 ( width of beam should not be less than 200 mm).

Span of cantilever beam = 2000mm

Effective depth of beam d = 2000/7=285mm

Total depth of beam = effective depth + diameter of bar/2 + clear cover size.

Assume clear cover size = 25mm

Diameter of bar =16mm

Total depth D = 285mm +16/2mm +25mm

Total depth D= 318mm, It should be taken as 325mm.

Width of beam = D/1.5, 325/1.5 = 216mm, so width of beam should be not less than 200mm in case of Block wall and 225mm in case of Brick wall. So width of beam taken as 225mm least.

Now check it,

Width/depth =225/325 =0.69 > 0.3, it is safe

Now we can check depth of beam = 1/4×2000= 500 > 300, yes it is safe.

**Depth and width of cantilever beam**

cantilever beam with 2m span, 9″ thick Brick wall, using thumb rule, beam depth shold be 325mm and width 225mm, beam size 9″×13″ (225mm ×325mm) using 4nos of 16mm bar of Fe500 steel with minimum M20 grade of concrete and stirrups [email protected]″C/C.

**3) Calculation of depth and width of continuous beam:-**

Note as per IS – 13920

A) the width to depth ratio should be more than 0.3 ( width/depth > 0.3).

B) depth of beam shall not be exceeded One by fourth (1/4) of clear span.

Let clear span of continuous beam = 5m = 5000mm

Effective depth = span/basic value

Total depth = effective depth + diameter of bar/2 + clear cover size.

Width of beam = Depth/1.5 ( width of beam should not be less than 200 mm).

Span of continuous beam = 5000mm

Effective depth of beam d = 5000/26=192.3mm

Total depth of beam = effective depth + diameter of bar/2 + clear cover size.

Assume clear cover size = 25mm

Diameter of bar =16mm

Total depth D = 192mm +16/2mm +25mm

Total depth D= 225mm, It should be taken as 225mm.

Width of beam = D/1.5, 225/1.5 = 150mm, so width of beam should be not less than 200mm in case of Block wall and 225mm in case of Brick wall. So width of beam taken as 225mm least.

Now check it,

Width/depth =225/225 =1 > 0.3, it is safe

Now we can check depth of beam = 1/4×5000= 1250 > 300, yes it is safe.

**Depth and width of continuous beam**

continuous beam with 5m span, 9″ thick Brick wall, using thumb rule, beam depth shold be 225mm and width 225mm, beam size 9″×9″ (225mm ×225mm) using 4nos of 16mm bar of Fe500 steel with minimum M20 grade of concrete and stirrups [email protected]″C/C.

**Beam depth for 5m, 6m, 7m, 8m, 9m and 10m span & its formula**

**Beam depth to width ratio**:- as per IS – 13920

the width to depth ratio should be more than 0.3 ( width/depth > 0.3).

**Beam depth to span ratio**:- Calculation of minimum size of RCC beam as per IS 456 2000, for cantilever beam span to effective depth of beam ratio is 7, 20 for simply supported beam and 26 for continuous beam.

**Beam depth formula:-** beam is various type like cantilever beam, simply supported beam and continuous beam. Calculation of minimum size of RCC beam as per IS 456 2000, Beam depth formula for cantilever beam is L/7 (span to effective depth of beam ratio is 7) , L/20 for simply supported beam and L/26 for continuous beam.

**Beam depth for 3m to 4m span**

according to general Thumb Rule for residential building with rcc column, beam depth for 3m to 4m span should be 9″ (225mm), minimum beam size 9″×9″ (225mm × 225mm) is applicable, using 2nos of reinforcement size T12 at top and 2nos of reinforcement size T12 at bottom of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm,as desine structure, height of building and load applied on it.

**Beam depth for 5m span**

according to general Thumb Rule for residential building, beam depth for 5m span should be 300mm,minimum beam size for 5m span is 9″×12″ (225mm × 300mm) in which depth of beam is 300mm and width is 225mm, using 2nos of reinforcement size T16 at top and 2nos of reinforcement size T16 at bottom of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm,as desine structure, height of building and load applied on it.

For given span of beam =5m =5000mm, beam depth for simply supported beam is L/20, effective depth should be 5000/20 = 250mm, overall Depth = 250 +12/2+25 = 281mm, it should be taken depth as 300mm, width = 300/1.5= 200mm, but at least width should be 225mm, so beam size for 5m span is 9″×12″ (225mm × 300mm) in which depth of beam is 300mm and width is 225mm, using 2nos of reinforcement size T16 at top and 2nos of reinforcement size T16 at bottom of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm.

**Beam depth for 6m span**

according to general Thumb Rule for residential building, beam depth for 6m span should be 350mm,minimum beam size for 6m span is 10″×14″ (250mm × 350mm) in which depth of beam is 350mm and width is 250mm, using 2nos of reinforcement size T16 at top and 2nos of reinforcement size T16 at bottom of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm,as desine structure, height of building and load applied on it.

For given span of beam =6m =6000mm, beam depth for simply supported beam is L/20, effective depth should be 6000/20 =300 mm, overall Depth = 300 +16/2+25 = 333mm, it should be taken depth as 350mm, width = 350/1.5= 233mm, which is taken as 10″ (250mm), so beam size for 6m span is 10″×14″ (250mm × 350mm) in which depth of beam is 350mm and width is 250mm, using 2nos of reinforcement size T16 at top and 2nos of reinforcement size T16 at bottom of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm.

**Beam depth for 7m span**

according to general Thumb Rule for residential building with rcc column, beam depth for 7m span should be 400mm,minimum beam size for 7m span is 12″×16″ (300mm × 400mm) in which depth of beam is 400mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as Crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm as desine structure, height of building and load applied on it.

For given span of beam =7m =7000mm, beam depth for simply supported beam is L/20, effective depth should be 7000/20 =350 mm, overall Depth = 350 +16/2+25 = 383mm, it should be taken depth as 400mm, width = 400/1.5= 266mm, which is taken as 12″ (300mm), so beam size for 7m span is 12″×16″ (300mm × 400mm) in which depth of beam is 400mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm.

**Beam depth for 8m span**

according to general Thumb Rule for residential building with rcc column, beam depth for 8m span should be 450mm,minimum beam size for 8m span is 12″×18″ (300mm × 450mm) in which depth of beam is 450mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as Crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm as desine structure, height of building and load applied on it.

For given span of beam =8m =7000mm, beam depth for simply supported beam is L/20, effective depth should be 8000/20 =400 mm, overall Depth = 400 +16/2+25 = 433mm, it should be taken depth as 450mm, width = 450/1.5= 300mm, which is taken as 12″ (300mm), so beam size for 8m span is 12″×18″ (300mm × 450mm) in which depth of beam is 450mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm.

**Beam depth for 9m span**

according to general Thumb Rule for residential building with rcc column, beam depth for 9m span should be 500mm,minimum beam size for 9m span is 12″×20″ (300mm × 500mm) in which depth of beam is 500mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as Crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm as desine structure, height of building and load applied on it.

For given span of beam =9m =9000mm, beam depth for simply supported beam is L/20, effective depth should be 9000/20 =450 mm, overall Depth = 450 +16/2+25 = 483mm, it should be taken depth as 500mm, width = 500/1.5=333 mm, which is taken as 12″ (300mm), so beam size for 9m span is 12″×20″ (300mm × 500mm) in which depth of beam is 500mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm.

**Beam depth for 10m span**

according to general Thumb Rule for residential building with rcc column, beam depth for 10m span should be 600mm,minimum beam size for 10m span is 12″×24″ (300mm × 600mm) in which depth of beam is 600mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as Crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm as desine structure, height of building and load applied on it.

For given span of beam =10m =10000mm, beam depth for simply supported beam is L/20, effective depth should be 10000/20 =500 mm, overall Depth = 500 +16/2+25 = 533mm, it should be taken depth as 600mm, width = 600/1.5= 400mm, which is taken as 12″ (300mm), so beam size for 10m span is 12″×24″ (300mm × 600mm) in which depth of beam is 600mm and width is 300mm, using 2nos of reinforcement size T16 at top, 2nos of reinforcement size T16 at bottom and 2nos of T12 as crank bar of Fe 500 used with m20 grade of concrete with stirrups of [email protected]″C/C with clear cover 25mm.