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Design and Calculation of Reinforced Column

Design and Calculation of Reinforced Column

The building shown has 3 storeys for Design and Calculation of Reinforced Column

1.Calculation of Load on Column

Load influence area on column B2(i.e.tributory area)

= (3.70/2 + 3.70/2) (6.0/2 + 6.0/2) = 22m2

Load on column B2 due to 1st storey

= 22.0 x 12 = 264 KN

(Area)x(Coef. As per table-1 of previous page)

Total load on column B2 = 792 KN say 800 KN

[Due to 3 storeys (264×3)]Calculation of Reinforced Column

2.Design of Column

Load on Column = 800 KN

Concrete grade = M20(say)

As per table-3,for 230 mm 450mm size,

If 1.40% of steel is provided,

If’s load carrying capacity = 813 KN (>800 KN)

Hence ok

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Calculation of Reinforced Column

Steel area = (1.4/100) x 230 x 450 = 1449 mm2

Hence provide 8 nos of 16mm dia bars (ref. table-2 also)

Lateral ties(rings)

Provide 8 mm diameter rings @ 8” c/c

Design of Column without Table in Hand

For M20 concrete & Fe 415 steel,

Load Carrying Capacity of Column with 2% reinft = (0.90) Cross section Area of concrete in “cm2”

Therefore Load Carrying Capacity of (300×300) column with 2% reinft = 0.90 x 30 x 30 = 810 KN

Hence ok (>800KN)

Size of Column : 300 x 300mm

Reinforcement = 2% = (2/100) x 30 x 30 = 18 c m2

Hence Provide (4Nos – 20mm dia + 4 Nos – 16mm dia)

load carrying capacity m30

Safe load carrying of column based on % of steel and known column section for various grade of concrete and steel for Design and Calculation of Reinforced Column

Steel Grade Fe 415 Fe 500
Concrete Grade
M20 P = (2.7005 p + 8) bD/1500 P = (3.27p + 8) bD/1500
M25 P = (2.6805 p + 10) bD/1500 P = (3.25p + 10) bD/1500
M30 P = (2.6605 p + 12) bD/1500 P = (3.23p + 12) bD/1500
M35 P = (2.6405 p + 14) bD/1500 P = (3.21p + 14) bD/1500
M40 P = (2.6205 p + 16) bD/1500 P = (3.19p + 16) bD/1500

Where P is Axial Load carrying capacity of column in KN.

P = % of steel reinforcement (say 2 % is 2)

b = Breadth of Column in mm

D = Depth of Column in mm

See More Structural Design

concrete reinforcement

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