RCC Column Design

Rcc column design is an important part of designing any building. Column is the main supporting structural member of any building.

Column: Column is defined as compression member which has an effective length greater than its least lateral dimension.

Lets design column with an example,

Example: Design an R. C. C. square short column subjected to axial services compressive load of 600 KN. Concrete used is M -20 and Steel Fe – 500. Draw reinforcement details. Provide 1 % steel. Take the factor of safety 1.5.

Solution:

Column Details

RCC Column Design

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Fck = 20 N/mm2

Fy = 500 N/mm2

Ag = Gross area of Column

Area of Steel in concrete(Asc) = (1/100) x Ag

Area of Concrete(Ac) = Gross area of column(Ag) – Area of steel(Asc) Ac = Ag – 0.01 Ag

Ac = 0.99 Ag

Pu = Axial load on Column (600 x 1.5) = 900 KN

Pu = 0.4 fck x Ac + 0.67 x Fy x Asc (IS: 456 – 2000 P – 71)

900 x 103 = 0.4 x 20 x ( 0.99 Ag) + 0.67 x 500 x 0.01 Ag

Ag = 79858 mm2

Square Column, Size of Column = √(79858) = 282.59 mm

Provide square column size = 285 mm x 285 mm

Ag = Provided = (285 mm x 285 mm) = 81225 mm2

Asc = Area of steel in concrete

= 0.01 Ag = 0.01 x 81225 = 812.25 mm2

Provide 8 nos. – 12 mm Dia. steel bar having Ast (Area of steel) = 905 mm2

RCC Column Design

Dia of lateral ties: (IS: 456 -2000 P – 49)

(i) 1/4 x Dia. of larger bar = 1/4 x 12 = 3 mm (ii) 8 mm Provide larger of 2 values (Provide 8 mm dia. lateral ties)

Pitch of Lateral Ties: (IS: 456 -2000 P – 49)

(i) Least lateral dimension = 285 mm (ii) 16 x Dia of smaller bar = 16 x 12 = 192 mm (ii) 300 mm Provide smaller of 3 values (Provide Pitch = 190 mm)

Provide 8 mm Dia. lateral ties at 190 mm c/c

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RCC Column Design

Design Column in Excel Sheet

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