7 step procedure for “Design of Doubly reinforced sections”
In our article series for “Design of Doubly reinforced sections”, we covered the following:
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)
Find xc by
σcbc/ (σst/m) = xc/(d – xc)