Design of Singly reinforced sections | Design Method 2

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Guide to design of Singly reinforced Sections

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

 

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)
Stress-strain diagram
Stress-strain diagram

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)

 

 

4 thoughts on “Design of Singly reinforced sections | Design Method 2”

  1. 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

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