#### Guide to design of Singly reinforced Sections

**For “Singly reinforced sections” article series, we have covered the following:**

- Basic definitions and formulas
- Understanding stresses and modular ratios
- Assumptions for singly reinforced sections
- Design procedure for Singly reinforced section – I
- Solved Numericals for Singly reinforced beam | Method I
- Design of Singly reinforced sections | Design Method 2
- Solved Numericals for Singly reinforced beam | Method 2
- Moment of Resistance for Singly reinforced sections
- Solved numerical example | Moment of resistance
- Solved numerical example 2 | Guide to singly reinforced sections

**Now we will move on with our discussion on “2nd Design method” for the design of Singly reinforced Sections.**

**We will follow a simple three-step procedure for the design of singly reinforced sections.**

#### Step One:

**Given that:**

- Dimensions of section (b and d)
- Area of tensile steel (Ast)
- Modular ratio (m)

**From the figure above, we can see that the neutral axis is situated at the centre of gravity of a given section. Therefore, the moments of area on either side are equal**.

Therefore, moment of area on compression side = moment of area on tension side

Moment of area on compression side = Area of compression side x distance of c.g. of compression area from N.A.

= (bx).(x/2)

= bx.x/2

#### Step Two:

Moment of area on tension side = equivalent area of concrete x distance of c.g. of tensile steel from N.A.

= (m Ast) x (d-x)

= mAst(d-x)

#### Step three:

Where, mAst = equivalent area of concrete

Therefore, bx.x/2 = mAst (d – x)

i need rcc structure steel dezine for 45 * 90feet hall. Including

Beam & Coloum dezine . For singel story hall.

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hi,this is very helpful sight and I have cleared many douts.I want to know about the designing of the foundation and columns.like assume a area of land and then how to design a foundation and columns(how many column to be needed with dimension) and what type of foundation should be laid.please clear these questions

Hello Sofia,

Check out the following link. This shall be of help to you.

Building Design Guide | Structural design