**Column size| what is the column size for 1, 2, 3 and 4 storey building?** Hi guys in this article we know about column size for 1 storey, 2 storey, 3 storey and 4 storey building & minimum size of RCC column according to IS code 456.

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**What is the column size?**

Column has not fixed size, it generally depends on different aspects such as loads acting on column, material used in column, grade of concrete, span between two column etc. According to these aspects the size of rcc column should be assumed or accepted as well as after that verification for safety is required.

There are different types of columns used in construction such as RCC column, long column, short column, timber columns and tied column etc. But todays, RCC column are mostly preferred and use as structures member for support and resist the load that acting on it, because it is economical and also resist more load easily.

Column size:- generally the size of column should not be less than 9” x 9” inches (230mm × 230mm) in respect to their width and depth for one storey/ first floor/ ground floor building with 4 bars of 12mm Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C.

**Point to be care during column design**

**When we go through the column design we should mention following point**: 1) the possible distance or span and depth it all depend on load to which the beam is subjected, 2) column size depend on amount of load on the column acting on it by beam and RCC slab, 3) many axial and Lateral load acting on column, 4) large span greatly influence the bending moment not only on beam, but it also affect the column due to stress acting on it, 5) Thumb Rule for column design are appropriate for very small project like G+1,G+2 & G+3 Building and 6) column design for building construction it depend on many factors like topography, whether and size of building.

In this article, we will go through the essential **thumb rules** to be followed for giving a column layout. Off course columns have to be designed in accordance to the total forces acting on the structure, but apart from that, it is essential for every Civil engineer and Architect to remember a few thumb rules so that they are prevented from making mistakes.

Three thumb rules for design of column to be followed are as follows:1)Size of the Columns, 2)Distance between Columns & 3)Alignment of columns.

**The size of the columns depends on the total load on the columns**. There are axial loads and lateral loads. Large beam spans induce bending moment not only in the beams, but also in columns which are pulled by the stresses in the beams.

**Minimum size of RCC column**

**Minimum size of RCC column:**-minimum size of an RCC column should not be less than 9”x 9” (225mm x 225mm) with 4 bars of 12mm Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C.

**Standard size of column**

Standard size of an RCC column should not be less than 9”x 9” (225mm x 225mm) with 4 bars of 12mm Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C. I will recommended 9″ × 12″ (230mm × 300mm) standard size of RCC column for ground floor residential building.

**Column size for ground floor/1st floor building**

**Column size for ground floor/1st floor building:-** For this general thumb rule, we will assume a structure of ground/1st floor residential building, using standard 5″ walls, size of an RCC column should be 9”x 9” (230mm x 230mm) with 4 bars of 12mm Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C.

**Column size for 2 storey (G+1) building**

**Column size for 2 storey (G+1) building:-** For this general thumb rule, we will assume a structure of G+1 (2 storey) residential building, using standard 5″ walls, size of an RCC column should be 9”x 12” (230mm x 300mm) with 6 bars of 12mm Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C.

**Column size for 3 storey (G+2) building**

**Column size for 3 storey (G+2) building:-** For this general thumb rule, we will assume a structure of G+2(3 storey) residential building, using standard 5″ walls, size of an RCC column should be 12”x 12” (300mm x 300mm) with 6 bars of 12mm Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C.

**Column size for 4 storey (G+3) building**

**Column size for 4 storey (G+3) building:-** For this general thumb rule, we will assume a structure of G+3/4 storey residential building, using standard 5″ walls, size of an RCC column should be 12”x 15” (300mm x 380mm) with 4 bars of 16mm and 2 bars of 12mm Fe500 Steel with m25 grade of concrete and stirrups of [email protected]″C/C.

**Column size for 5 storey (G+4) building**

**Column size for 5 storey (G+4) building:-** For this general thumb rule, we will assume a structure of G+4/5 storey residential building, using standard 5″ walls, size of an RCC column should be 12”x 18” (300mm x 450mm) with 4 bars of 16mm and 4 bars of 12mm Fe500 Steel with m25 grade of concrete and stirrups of [email protected]″C/C.

These days the minimum I use in my projects is 9″ x 12″ (225 mm x 300mm) with 6 bars of 12 MM Fe500 steel. You can never go wrong with strong columns. I also recommend use of M20 grade concrete for the structure (ratio 1 part Cement : 1.5 parts Sand : 3 parts Aggregate with 0.5 parts water by volume). I recommend use of 8 MM stirrups at a distance of 150 MM center to center throughout the length of column.

This setup of 9″ x 12″ RCC columns is safe for G+1 Floors. There are a lot of other considerations, but this is just a thumb rule.