Column design is an important part of designing any building. The column is the main supporting structural member of any building.
Column: A column is defined as a compression member with an effective length greater than its least lateral dimension.
Let’s the design of the column with an example,
Column Design
Example: Column Design as per IS 456 square short column subjected to axial services compressive load of 600 KN.
The concrete used is M -20 and Steel Fe – 500. Draw reinforcement details. Provide 1 % steel. Take the factor of safety 1.5.
Solution
RCC Column Design
- 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
Read More: How to Calculate Steel Quantity For Slab Excel Sheet
RCC Column Size Calculation
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)
The 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
14. Provide smaller of 3 values (Provide Pitch = 190 mm)
Provide 8 mm Dia. lateral ties at 190 mm c/c
Read More: Load Calculation on Column, Beam, and Slab
Column Design Excel Sheet as per IS 456 Free Download
RCC Column Design Excel Sheet Click Below,
Column Design Excel Sheet – Download
Watch Video: Learn How To Use Column Design Excel Sheet
FAQs:
How to calculate RCC column size?
To calculate RCC Column size it is required to know the parameters such as factored load on the column, the grade of steel, and the grade of concrete. Put the known value of parameters in the factored load formula. Factored load formulas are useful for calculating the size of beams of various shapes with the min size requirement of 230 mm x 230 mm.
How do you design a column?
The column can be designed using Excel sheets when required frequently throughout the project. One needs only to put values in an excel sheet once the excel sheet is made available. Complete details of the Designing column are given in this article.
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Awesome amount of details! Am glad you have taken the pains to collate and present so much knowledge in simple terms for easy understanding . Great job, friend. You are blessed with the best! TSiva Hosur तमिलनाडु
Thank you sir
RCC column design