Design of Singly reinforced Sections | Method 2
In our article series for Singly reinforced sections, 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
Numerical Problem
Find the position of the neutral axis of a reinforced concrete beam 150mm wide and 400mm deep (effective). Area of tensile steel is 804mm2. (modular ratio = m = 18.66)
Step One:
Given that:
b = breadth of a rectangular beam = 150mm
d = effective depth of a beam = 400mm
Ast = cross-sectional area of steel in tension = 804mm2
x = depth of neutral axis below the compression edge
m = modular ratio = 18.66
Taking moments of area of compression and tension sides about neutral axis,
bx.x/2 = mAst (d – x)