7 step procedure for “Design of Doubly reinforced sections”
In our article series for “Design of Doubly reinforced sections”, we covered the following:
What are doubly reinforced sections?
Methods for determining Neutral Axis?
Solved numerical examples for determining Neutral Axis
Numerical examples for practice (Find Neutral axis)
Methods for calculating Moment of Resistance
Numerical example for calculating Moment of resistance
Types of problems in Doubly reinforced sections
6 step prodecure for determining stresses in steel and concrete
Numerical example | Stresses in steel and concrete
In our previous article, we discussed a detailed 6 step procedure for determining stresses in steel and concrete followed by a numerical example. Now we shall move on with the “design procedure for doubly reinforced sections”.
Generally the following data are given:
Breadth of the beam = b
Effective depth of the beam = d
Permissible stress in concrete = σcbc
Permissible stress in steel = σst
Modular ratio = m
Bending moment = M
To solve a problem, the following procedure may be followed.
Design the beam as a singly reinforced one (balanced section)
Step One:
Find xc by
σcbc/ (σst/m) = xc/(d – xc)