Guide to design of Singly reinforced Sections | Building Construction
For the “design of 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 next solved numerical example in which we will make use of the formulas that we have derived in our earlier articles.
Numerical Problem
Determine the following:
a) The position of the neutral axis
b) Lever arm
c) Moment of resistance
d) Percentage of steel
(For a rectangular beam section of width b mm and effective depth d mm. Take σcbc = 5 N/mm2, σst = 140 N/mm2, m = 18.66
To find Neutral Axis (NA)
σcbc /(σst/m) = xc/(d – xc)
5/(140/18.66) = xc/(d – xc)
Therefore, xc = 0.399d mm= 0.4dmm